In order to respond to this unprecedented crisis, the Empire was drastically reorganized. As established by Hellenistic political practice, philosophies and Orthodox doctrines, power had been concentrated in military leaders strategoi who acted as viceroys in their respective "théma", being appointed by the emperor alone. Their main function around each was the collection of taxes from the different communities "chora", "komai" and from the different states "proasteion" as well as the management of fast and flexible provincial armies. The remaining imperial territory in Asia Minor was divided into four large themes, and although some elements of the earlier civil administration survived, they were subordinated to the governing general or stratēgos.
The origin and early nature of the themes has been heavily disputed amongst scholars. The very name théma is of uncertain etymology, but most scholars follow Constantine Porphyrogennetos, who records that it originates from Greek thesis ("placement"). The date of their creation is also uncertain. For most of the 20th century, the establishment of the themes was attributed to the Emperor Heraclius (r. 610–641), during the last of the Byzantine–Sassanid Wars. Most notable amongst the supporters of this thesis was George Ostrogorsky who based this opinion on an extract from the chronicle of Theophanes the Confessor mentioning the arrival of Heraclius "in the lands of the themes" for the year 622. According to Ostrogorsky, this "shows that the process of establishing troops (themes) in specific areas of Asia Minor has already begun at this time." This view has been objected to by other historians however, and more recent scholarship dates their creation later, to the period from the 640s to the 660s, under Constans II (r. 641–668). It has further been shown that, contrary to Ostrogorsky's conception of the thémata being established from the outset as distinct, well-defined regions where a stratēgos held joint military and civil authority, the term théma originally seems to have referred exclusively to the armies themselves, and only in the later 7th or early 8th centuries did it come to be transferred to the districts where these armies were encamped as well.
Tied to the question of chronology is also the issue of a corresponding social and military transformation. The traditional view, championed by Ostrogorsky, holds that the establishment of the themes also meant the creation of a new type of army. In his view, instead of the old force, heavily reliant on foreign mercenaries, the new Byzantine army was based on native farmer-soldiers living on state-leased military estates (compare the organization of the Sasanian aswārān). More recent scholars however have posited that the formation of the themes did not constitute a radical break with the past, but rather a logical extension of pre-existing, 6th-century trends, and that its direct social impact was minimal.
What is clear is that at some point in the mid-7th century, probably in the late 630s and 640s, the Empire's field armies were withdrawn to Anatolia, the last major contiguous territory remaining to the Empire, and assigned to the districts that became known as the themes. Territorially, each of the new themes encompassed several of the older provinces, and with a few exceptions, seems to have followed the old provincial boundaries. The first four themes were those of the Armeniacs, Anatolics and Thracesians, and the Opsician theme. The Armeniac Theme (Θέμα Ἀρμενιακῶν, Théma Armeniakōn), first mentioned in 667, was the successor of the Army of Armenia. It occupied the old areas of the Pontus, Armenia Minor and northern Cappadocia, with its capital at Amasea. The Anatolic Theme (Θέμα Ἀνατολικῶν, Anatolikōn), first mentioned in 669, was the successor of the Army of the East (Aνατολῆ, Anatolē). It covered southern central Asia Minor, and its capital was Amorium. Together, these two themes formed the first tier of defence of Byzantine Anatolia, bordering Muslim Armenia and Syria respectively. The Thracesian Theme (Θέμα Θρᾳκησίων, Théma Thrakēsiōn), first mentioned clearly as late as c. 740, was the successor of the Army of Thrace, and covered the central western coast of Asia Minor (Ionia, Lydia and Caria), with its capital most likely at Chonae. The Opsician Theme (Θέμα Ὀψικίου, Théma Opsikiou), first mentioned in 680, was constituted from the imperial retinue (in Latin Obsequium). It covered northwestern Asia Minor (Bithynia, Paphlagonia and parts of Galatia), and was based at Nicaea. Uniquely, its commander retained his title of kómēs (κόμης, "count").
Thus, by the turning of the century, the themes had become the dominant feature of imperial administration. Their large size and power however made their generals prone to revolt, as had been evidenced in the turbulent period 695–715, and would again during the great revolt of Artabasdos in 741–742. The suppression of Artabasdos' revolt heralded the first significant changes in the Anatolian themes: the over-mighty Opsikion was broken up with the creation of two new themes, the Bucellarian Theme and the Optimates, while the role of imperial guard was assumed by a new type of professional force, the imperial tagmata.
Despite the prominence of the themes, it was some time before they became the basic unit of the imperial administrative system. Although they had become associated with specific regions by the early 8th century, it took until the end of the 8th century for the civil fiscal administration to begin being organized around them, instead of following the old provincial system. This process, resulting in unified control over both military and civil affairs of each theme by its strategos, was complete by the mid-9th century, and is the "classical" thematic model mentioned in such works as the Klētorologion and the De Administrando Imperio.
At the same time, the need to protect the Anatolian heartland of Byzantium from the Arab raids led to the creation, in the later 8th and early 9th centuries, of a series of small frontier districts, the kleisourai or kleisourarchiai ("defiles, enclosures"). The term was previously used to signify strategically important, fortified mountain passages, and was now expanded to entire districts which formed separate commands under a kleisourarchēs, tasked with guerrilla warfare and locally countering small to mid-scale incursions and raids. Gradually, most of these were elevated to full themes.
With the beginning of the Byzantine offensives in the East and the Balkans in the 10th century, especially under the warrior-emperors Nikephoros II (r. 963–969), John I Tzimiskes (r. 969–976) and Basil II (r. 976–1025), newly gained territories were also incorporated into themes, although these were generally smaller than the original themes established in the 7th and 8th centuries.
At this time, a new class of themes, the so-called "minor" (μικρὰ θέματα) or "Armenian" themes (ἀρμενικὰ θέματα) appear, which Byzantine sources clearly differentiate from the traditional "great" or "Roman" themes (ῥωμαϊκά θέματα). Most consisted merely of a fortress and its surrounding territory, with a junior stratēgos (called zirwar by the Arabs and zoravar by the Armenians) as a commander and about 1,000 men, chiefly infantry, as their garrison. As their name reveals, they were mostly populated by Armenians, either indigenous or settled there by the Byzantine authorities. One of their peculiarities was the extremely large number of officers (the theme of Charpezikion alone counted 22 senior and 47 junior tourmarchai).
While well suited for defence, the "Armenian" themes were incapable of responding to major invasions or undertake sustained offensive campaigns on their own. Thus, from the 960s, more and more professional regiments, both from the old tagmata and newly raised formations, were stationed along the border. To command them as well as coordinate the forces of the small frontier themes, a number of large regional commands ("ducates" or "catepanates"), under a doux or katepano, were set up. In the East, the three original such commands, set up by John Tzimiskes, were those of the doukes of Antioch, Chaldia and Mesopotamia. As Byzantium expanded into Greater Armenia in the early 11th century, these were complemented or replaced by the commands of Iberia, Vaspurakan, Edessa and Ani. In the same vein, the "Armenian" themes seem to have been placed under a single strategos in the mid-11th century.
The series of soldier-emperors culminating in Basil II led to a situation where by 1025 Byzantium was more powerful than any of its enemies. At the same time, the mobile, professional forces of the tagmata gained in importance over the old thematic armies (and fleets) of the interior, which soon began to be neglected. Indeed, from the early 11th century military service was increasingly commuted to cash payments. While the frontier ducates were able to meet most local threats, the dissolution of the old theme-based defensive system deprived the Byzantine defensive system of any strategic depth. Coupled with increasing reliance on foreign mercenaries and the forces of allied and vassal states, as well as the revolts and civil wars resulting from the widening rift between the civilian bureaucracy in Constantinople and the land-holding military elites (the dynatoi), by the time of the Battle of Manzikert in 1071, the Byzantine army was already undergoing a severe crisis and collapsed completely in the battle's aftermath.
The now irrelevant micro provinces under imperial control were organized directly into katepanakias or kephalatikion each also ruled by a Katepan or Kephale with military and civic powers centered around forts and major passes, relegating all minor tasks to deputies.
The commander of a theme, however, did not only command his soldiers. He united the civil and military jurisdictions in the territorial area in question. Thus the division set up by Diocletian between civil governors (praesides etc.) and military commanders (duces etc.) was abolished, and the Empire returned to a system much more similar to that of the Republic or the Principate and directly linkeable to the system of Eparchies and Strategiai set up in the Hellenistic Seleucid and Mithridatric Kingdoms respectively, which were military in origin and organization as well, where provincial governors had also commanded the armies in their area.
The following table illustrates the thematic structure as found in the Thracesian Theme, c. 902-936:
This list includes the large "traditional" themes established in the period from the inception of the theme system in c. 660 to the beginning of the great conquests in c. 930 and the creation of the new, smaller themes.
These were the new major or minor themes (provinces), established during the Byzantine conquests, in the East (the so-called "Armenian" themes or generalships, strategiai), in Italy and in the Balkans.
Bréhier 2000, pp. 98–101 - Bréhier, Louis (2000) [1949], Les institutions de l'empire byzantin (in French), Paris: Albin Michel, ISBN 978-2-226-04722-9
Haldon 1990, p. 210 - Haldon, John F. (1990), Byzantium in the Seventh Century: The Transformation of a Culture, Cambridge University Press, ISBN 978-0-521-31917-1 https://books.google.com/books?id=pSHmT1G_5T0C
Bréhier 2000, pp. 93–98 - Bréhier, Louis (2000) [1949], Les institutions de l'empire byzantin (in French), Paris: Albin Michel, ISBN 978-2-226-04722-9
BURY., J.B (2018). HISTORY OF THE LATER ROMAN EMPIRE from the death of theodosius i to the death of justinian. CHARLES RIVER EDITORS. ISBN 978-1-61430-462-3. OCLC 1193333944. 978-1-61430-462-3
Heather, Peter; Moncur, David (January 2001). Politics, Philosophy, and Empire in the Fourth Century. Liverpool: Liverpool University Press. doi:10.3828/978-0-85323-106-6 (inactive 2024-11-11). ISBN 978-0-85323-106-6.{{cite book}}: CS1 maint: DOI inactive as of November 2024 (link) 978-0-85323-106-6
Kazhdan 1991, p. 2035 - Kazhdan, Alexander, ed. (1991). The Oxford Dictionary of Byzantium. Oxford and New York: Oxford University Press. ISBN 0-19-504652-8.
Kazhdan 1991, p. 2034 - Kazhdan, Alexander, ed. (1991). The Oxford Dictionary of Byzantium. Oxford and New York: Oxford University Press. ISBN 0-19-504652-8.
Haldon 1990, p. 215 - Haldon, John F. (1990), Byzantium in the Seventh Century: The Transformation of a Culture, Cambridge University Press, ISBN 978-0-521-31917-1 https://books.google.com/books?id=pSHmT1G_5T0C
Cheynet 2006, pp. 151–152 - Cheynet, Jean-Claude, ed. (2006), Le Monde Byzantin II: L'Empire byzantin (641–1204) (in French), Paris: Presses Universitaires de France, ISBN 978-2-13-052007-8
Ostrogorsky 1997, p. 101 - Ostrogorsky, George (1997), History of the Byzantine State, Rutgers University Press, ISBN 978-0-8135-1198-6 https://archive.org/details/historyofbyzanti00ostr
Treadgold 1997, p. 316 - Treadgold, Warren (1997). A History of the Byzantine State and Society. Stanford, California: Stanford University Press. ISBN 0-8047-2630-2. https://books.google.com/books?id=nYbnr5XVbzUC
Haldon 1990, pp. 214–215 - Haldon, John F. (1990), Byzantium in the Seventh Century: The Transformation of a Culture, Cambridge University Press, ISBN 978-0-521-31917-1 https://books.google.com/books?id=pSHmT1G_5T0C
Kazhdan 1991, p. 2034 - Kazhdan, Alexander, ed. (1991). The Oxford Dictionary of Byzantium. Oxford and New York: Oxford University Press. ISBN 0-19-504652-8.
Cheynet 2006, p. 152 - Cheynet, Jean-Claude, ed. (2006), Le Monde Byzantin II: L'Empire byzantin (641–1204) (in French), Paris: Presses Universitaires de France, ISBN 978-2-13-052007-8
Kazhdan 1991, p. 2034 - Kazhdan, Alexander, ed. (1991). The Oxford Dictionary of Byzantium. Oxford and New York: Oxford University Press. ISBN 0-19-504652-8.
Haldon 1990, pp. 212–216 - Haldon, John F. (1990), Byzantium in the Seventh Century: The Transformation of a Culture, Cambridge University Press, ISBN 978-0-521-31917-1 https://books.google.com/books?id=pSHmT1G_5T0C
Kazhdan 1991, p. 177 - Kazhdan, Alexander, ed. (1991). The Oxford Dictionary of Byzantium. Oxford and New York: Oxford University Press. ISBN 0-19-504652-8.
Haldon 1999, pp. 73, 112 - Haldon, John (1999). Warfare, State and Society in the Byzantine World, 565–1204. London: UCL Press. ISBN 1-85728-495-X. https://books.google.com/books?id=5G1rV7tS79sC
Kazhdan 1991, p. 90 - Kazhdan, Alexander, ed. (1991). The Oxford Dictionary of Byzantium. Oxford and New York: Oxford University Press. ISBN 0-19-504652-8.
Haldon 1999, p. 73 - Haldon, John (1999). Warfare, State and Society in the Byzantine World, 565–1204. London: UCL Press. ISBN 1-85728-495-X. https://books.google.com/books?id=5G1rV7tS79sC
Kazhdan 1991, p. 2080 - Kazhdan, Alexander, ed. (1991). The Oxford Dictionary of Byzantium. Oxford and New York: Oxford University Press. ISBN 0-19-504652-8.
Haldon 1990, pp. 216–217 - Haldon, John F. (1990), Byzantium in the Seventh Century: The Transformation of a Culture, Cambridge University Press, ISBN 978-0-521-31917-1 https://books.google.com/books?id=pSHmT1G_5T0C
Haldon 1990, p. 217 - Haldon, John F. (1990), Byzantium in the Seventh Century: The Transformation of a Culture, Cambridge University Press, ISBN 978-0-521-31917-1 https://books.google.com/books?id=pSHmT1G_5T0C
Haldon 1999, p. 77 - Haldon, John (1999). Warfare, State and Society in the Byzantine World, 565–1204. London: UCL Press. ISBN 1-85728-495-X. https://books.google.com/books?id=5G1rV7tS79sC
Cheynet 2006, p. 155 - Cheynet, Jean-Claude, ed. (2006), Le Monde Byzantin II: L'Empire byzantin (641–1204) (in French), Paris: Presses Universitaires de France, ISBN 978-2-13-052007-8
Haldon 1990, p. 216 - Haldon, John F. (1990), Byzantium in the Seventh Century: The Transformation of a Culture, Cambridge University Press, ISBN 978-0-521-31917-1 https://books.google.com/books?id=pSHmT1G_5T0C
Haldon 1999, p. 87 - Haldon, John (1999). Warfare, State and Society in the Byzantine World, 565–1204. London: UCL Press. ISBN 1-85728-495-X. https://books.google.com/books?id=5G1rV7tS79sC
Kazhdan 1991, p. 2079 - Kazhdan, Alexander, ed. (1991). The Oxford Dictionary of Byzantium. Oxford and New York: Oxford University Press. ISBN 0-19-504652-8.
Kazhdan 1991, p. 911 - Kazhdan, Alexander, ed. (1991). The Oxford Dictionary of Byzantium. Oxford and New York: Oxford University Press. ISBN 0-19-504652-8.
Haldon 1999, p. 87 - Haldon, John (1999). Warfare, State and Society in the Byzantine World, 565–1204. London: UCL Press. ISBN 1-85728-495-X. https://books.google.com/books?id=5G1rV7tS79sC
Cheynet 2006, p. 146 - Cheynet, Jean-Claude, ed. (2006), Le Monde Byzantin II: L'Empire byzantin (641–1204) (in French), Paris: Presses Universitaires de France, ISBN 978-2-13-052007-8
Treadgold 1998, pp. 26–29 - Treadgold, Warren T. (1998), Byzantium and Its Army, 284–1081, Stanford University Press, ISBN 0-8047-3163-2 https://books.google.com/books?id=xfV0LkMNaLUC
Treadgold 1998, pp. 28–29, 71, 99, 210 - Treadgold, Warren T. (1998), Byzantium and Its Army, 284–1081, Stanford University Press, ISBN 0-8047-3163-2 https://books.google.com/books?id=xfV0LkMNaLUC
Haldon 1999, pp. 83–84 - Haldon, John (1999). Warfare, State and Society in the Byzantine World, 565–1204. London: UCL Press. ISBN 1-85728-495-X. https://books.google.com/books?id=5G1rV7tS79sC
Haldon 1999, p. 84 - Haldon, John (1999). Warfare, State and Society in the Byzantine World, 565–1204. London: UCL Press. ISBN 1-85728-495-X. https://books.google.com/books?id=5G1rV7tS79sC
Haldon 1999, pp. 79, 84, 114 - Haldon, John (1999). Warfare, State and Society in the Byzantine World, 565–1204. London: UCL Press. ISBN 1-85728-495-X. https://books.google.com/books?id=5G1rV7tS79sC
Kazhdan 1991, p. 1132 - Kazhdan, Alexander, ed. (1991). The Oxford Dictionary of Byzantium. Oxford and New York: Oxford University Press. ISBN 0-19-504652-8.
Treadgold 1998, pp. 33–37 - Treadgold, Warren T. (1998), Byzantium and Its Army, 284–1081, Stanford University Press, ISBN 0-8047-3163-2 https://books.google.com/books?id=xfV0LkMNaLUC
Haldon 1999, p. 84 - Haldon, John (1999). Warfare, State and Society in the Byzantine World, 565–1204. London: UCL Press. ISBN 1-85728-495-X. https://books.google.com/books?id=5G1rV7tS79sC
Treadgold 1998, pp. 80–84 - Treadgold, Warren T. (1998), Byzantium and Its Army, 284–1081, Stanford University Press, ISBN 0-8047-3163-2 https://books.google.com/books?id=xfV0LkMNaLUC
McGeer, Nesbitt & Oikonomides 2001, p. 143 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
Haldon 1999, pp. 84–85 - Haldon, John (1999). Warfare, State and Society in the Byzantine World, 565–1204. London: UCL Press. ISBN 1-85728-495-X. https://books.google.com/books?id=5G1rV7tS79sC
Treadgold 1998, pp. 35–36 - Treadgold, Warren T. (1998), Byzantium and Its Army, 284–1081, Stanford University Press, ISBN 0-8047-3163-2 https://books.google.com/books?id=xfV0LkMNaLUC
McGeer, Nesbitt & Oikonomides 2001, p. 143 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
Haldon 1999, pp. 85, pp. 90–93 - Haldon, John (1999). Warfare, State and Society in the Byzantine World, 565–1204. London: UCL Press. ISBN 1-85728-495-X. https://books.google.com/books?id=5G1rV7tS79sC
Birkenmeier, John (2002). The Development of the Kommenian Army: 1081-1180. Leiden, The Netherlands: Brill. p. 242. ISBN 9789004117105. 9789004117105
Frankopan, P. (2007-02-01). "Kinship and the Distribution of Power in Komnenian Byzantium". The English Historical Review. CXXII (495): 1–34. doi:10.1093/ehr/cel378. ISSN 0013-8266. https://dx.doi.org/10.1093/ehr/cel378
Haldon, John (2020-07-08). Warfare, State and Society in the Byzantine World, 565–1204. doi:10.1201/9781003070832. ISBN 9781003070832. 9781003070832
C., Bartusis, Mark (1997). The late Byzantine army : arms and society, 1204-1453. University of Pennsylvania Press. ISBN 0-8122-1620-2. OCLC 40455898.{{cite book}}: CS1 maint: multiple names: authors list (link) 0-8122-1620-2
C., Bartusis, Mark (1997). The late Byzantine army : arms and society, 1204-1453. University of Pennsylvania Press. ISBN 0-8122-1620-2. OCLC 40455898.{{cite book}}: CS1 maint: multiple names: authors list (link) 0-8122-1620-2
Ziche, Hartmut (2017-01-01), "Historians and the Economy: Zosimos and Prokopios on Fifth- and Sixth- Century Economie Development", Byzantine Narrative, BRILL, pp. 462–474, doi:10.1163/9789004344877_036, ISBN 9789004344877, retrieved 2022-03-13 9789004344877
Haldon 1999, pp. 86–87 - Haldon, John (1999). Warfare, State and Society in the Byzantine World, 565–1204. London: UCL Press. ISBN 1-85728-495-X. https://books.google.com/books?id=5G1rV7tS79sC
McGeer, Nesbitt & Oikonomides 2001, p. 148 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
Kühn 1991, pp. 64, 187–188 - Kühn, Hans-Joachim (1991), Die byzantinische Armee im 10. und 11. Jahrhundert: Studien zur Organisation der Tagmata (in German), Vienna: Fassbänder, ISBN 3-900538-23-9 https://books.google.com/books?id=c8LgAAAAMAAJ
McGeer, Nesbitt & Oikonomides 2001, p. 148 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
Kühn 1991, p. 63 - Kühn, Hans-Joachim (1991), Die byzantinische Armee im 10. und 11. Jahrhundert: Studien zur Organisation der Tagmata (in German), Vienna: Fassbänder, ISBN 3-900538-23-9 https://books.google.com/books?id=c8LgAAAAMAAJ
Kühn 1991, pp. 58, 63 - Kühn, Hans-Joachim (1991), Die byzantinische Armee im 10. und 11. Jahrhundert: Studien zur Organisation der Tagmata (in German), Vienna: Fassbänder, ISBN 3-900538-23-9 https://books.google.com/books?id=c8LgAAAAMAAJ
McGeer, Nesbitt & Oikonomides 2001, p. 149 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
Kühn 1991, p. 63 - Kühn, Hans-Joachim (1991), Die byzantinische Armee im 10. und 11. Jahrhundert: Studien zur Organisation der Tagmata (in German), Vienna: Fassbänder, ISBN 3-900538-23-9 https://books.google.com/books?id=c8LgAAAAMAAJ
McGeer, Nesbitt & Oikonomides 2001, p. 150 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
Kühn 1991, p. 63 - Kühn, Hans-Joachim (1991), Die byzantinische Armee im 10. und 11. Jahrhundert: Studien zur Organisation der Tagmata (in German), Vienna: Fassbänder, ISBN 3-900538-23-9 https://books.google.com/books?id=c8LgAAAAMAAJ
McGeer, Nesbitt & Oikonomides 2001, pp. 150–152 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
McGeer, Nesbitt & Oikonomides 2001, pp. 162–164 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
Kühn 1991, p. 64 - Kühn, Hans-Joachim (1991), Die byzantinische Armee im 10. und 11. Jahrhundert: Studien zur Organisation der Tagmata (in German), Vienna: Fassbänder, ISBN 3-900538-23-9 https://books.google.com/books?id=c8LgAAAAMAAJ
Kühn 1991, p. 64 - Kühn, Hans-Joachim (1991), Die byzantinische Armee im 10. und 11. Jahrhundert: Studien zur Organisation der Tagmata (in German), Vienna: Fassbänder, ISBN 3-900538-23-9 https://books.google.com/books?id=c8LgAAAAMAAJ
McGeer, Nesbitt & Oikonomides 2001, pp. 152–153 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
McGeer, Nesbitt & Oikonomides 2001, pp. 166–168 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
Kühn 1991, p. 64 - Kühn, Hans-Joachim (1991), Die byzantinische Armee im 10. und 11. Jahrhundert: Studien zur Organisation der Tagmata (in German), Vienna: Fassbänder, ISBN 3-900538-23-9 https://books.google.com/books?id=c8LgAAAAMAAJ
McGeer, Nesbitt & Oikonomides 2001, pp. 153–154 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
McGeer, Nesbitt & Oikonomides 2001, p. 156 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
McGeer, Nesbitt & Oikonomides 2001, pp. 156–160 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
McGeer, Nesbitt & Oikonomides 2001, pp. 160–161 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
Kühn 1991, p. 64 - Kühn, Hans-Joachim (1991), Die byzantinische Armee im 10. und 11. Jahrhundert: Studien zur Organisation der Tagmata (in German), Vienna: Fassbänder, ISBN 3-900538-23-9 https://books.google.com/books?id=c8LgAAAAMAAJ
McGeer, Nesbitt & Oikonomides 2001, p. 161 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
McGeer, Nesbitt & Oikonomides 2001, pp. 168–170 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
McGeer, Nesbitt & Oikonomides 2001, pp. 161–162 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
McGeer, Nesbitt & Oikonomides 2001, pp. 170–171 - McGeer, Eric; Nesbitt, John; Oikonomides, Nicolas, eds. (2001). Catalogue of Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, Volume 4: The East. Washington, DC: Dumbarton Oaks Research Library and Collection. ISBN 0-88402-282-X. https://books.google.com/books?id=86Of2XxW2NMC
Angold 1975, p. 247 - Angold, Michael (1975). A Byzantine Government in Exile: Government and Society Under the Laskarids of Nicaea (1204–1261). Oxford, United Kingdom: Oxford University Press. ISBN 0-19-821854-0.
Angold 1975, p. 248f - Angold, Michael (1975). A Byzantine Government in Exile: Government and Society Under the Laskarids of Nicaea (1204–1261). Oxford, United Kingdom: Oxford University Press. ISBN 0-19-821854-0.
Angold 1975, p. 246 - Angold, Michael (1975). A Byzantine Government in Exile: Government and Society Under the Laskarids of Nicaea (1204–1261). Oxford, United Kingdom: Oxford University Press. ISBN 0-19-821854-0.