The name of the 8-day cycle is based upon the Latin word for "nine" because the Romans tended to count dates inclusively. Each nundinae was thought to follow the next after a 9-day interval because the first day was included in the count.
All patrician business was originally suspended during the nundinae but it seems to have been fasti by the time of the Twelve Tables and, among its provisions, the Hortensian Law (Lex Hortensia) of 287 BC permitted their use for most legal and business purposes. Dates otherwise permitted for public assemblies (dies comitialis) were still downgraded if a nundinae occurred on them.
The theoretical proscriptions concerning the nundinae were not always observed. The rebellion of M. Aemilius Lepidus in 78 BC was later remembered as an example of the pernicious effects of having the nundinae occur on the January kalends; the New Year was allowed to coincide with a market again in 52 BC. Cicero complains in one of his letters about a contio being held in the Circus Flaminius despite the nundinae. Following the 46 BC Julian reform of the calendar, the inalterable nature of its leap day intercalation meant that the nundinae began to fall upon the supposedly unlucky days of 1 January and the nones of each month. Early on in the Julian calendar, though, the strength of this superstition caused the priests to insert an extra day as under the former system; it was accommodated by removing another day sometime later in the year; this seems to have occurred in 40 BC and AD 44.
The nundinae of the late Republic and early Empire were possibly centered on the Circus Flaminius. Augustus supposedly avoided new undertakings on the days after nundinae (postridie nundinas), owing either to superstitions concerning homophones of non ("no, not") or analogy with the treatment of the days following kalends, nones, and ides.
The nundinal cycle formed a rhythm within quotidian Roman life. Farmers and craftsmen from Rome's hinterland would rest from work on the nundinae to visit the city, selling groceries and supplies which the Romans or their slaves would purchase for the next eight days. Auctions were held. Children and adolescents were exempted from school. It was a time of public merrymaking and Roman farming and slave manuals included stern warnings about permitting the vilicus, an enslaved overseer, too much free time during the visit to town lest he get caught up in mischief. The church authorities later issued similar admonitions concerning its clerics, priests, and bishops. Nundinae were used for dinner parties and public announcements, especially of coming assemblies and legislation. Later writers praising early Rome's rusticity and spartanness claimed that its farmers would busy themselves with labor during the week and only groom and fully bathe on the nundinae. Pliny describes the superstition, "religiously believed by many", that trimming one's nails silently during the nundinae or doing so beginning with the index finger provoked bad luck for one's finances. The nundinae were not the only markets at Rome, though, as there were both daily markets (macella) and periodic fairs (mercatus).
Although their religious nature was never very pronounced, the nundinae were allegedly dedicated to Saturn and Jupiter. The flaminica, the wife of Rome's high priest of Jupiter, offered a ram to that god at each nundinae. Inscriptions have been discovered from cults to both Jupiter Nundinarius and Mercury Nundinator. Superstitions arose about the ill luck when a nundinae would fall upon January 1st or the nones of any month and the pontiffs who controlled the calendar's intercalation until the Julian reform took steps to avoid such coincidences, usually by making the year 354 instead of 355 days long by removing a day from February or the intercalary month. Since the nones were definitionally eight days before each ides, this also had the unstated effect of avoiding nundinae on them as well. Macrobius's account of the origins of these superstitions is unsatisfying, however, and it is more likely that 1 January was avoided because its status as a general holiday was bad for business and the nones because of the ill luck attending their lack of a tutelary deity.
The 8-day nundinal cycle also seems to have been observed elsewhere in Italy, particularly Campania, as attested in stone calendars and graffiti, as at Pompeii. There are records from the imperial period of towns and villas petitioning for the right to hold such markets (ius nundinarum). Such a right seems to have been universally granted to the capitals of Italy's prefectures (praefecturae) but also extended to some smaller localities where markets were necessary for local trade. These local fairs used the same calendrical system as Rome's, marking out the days of the year into cycles from A to H, but each town or village in an area typically used a separate day, permitting itinerant traders (circumforanei) to attend each in turn.
The early Roman prejudice against commerce, especially the retail trade of the nundinal markets, means that the nundinae are usually referenced in negative contexts in Latin literature, particularly for the buying and selling of things that should not be sold such as virginity and love, medical treatment, education, government and church offices and favors, and judicial decisions. This bias endured into medieval Latin, where nundinatio ("marketing") without other qualification meant corruption, especially the purchase of judicial verdicts.
"nundine, n.", Oxford English Dictionary, Oxford: Oxford University Press.
Schmitz (1842), p. 648. - Schmitz, Leonhard (1842), "Nu'ndinae", in Smith, William (ed.), A Dictionary of Greek and Roman Antiquities, London: Taylor & Walton, p. 648 https://books.google.com/books?id=-XZqkmmiFWUC&pg=PA648
Michels (1967), p. 202. - Michels, Agnes Kirsopp Lake (1967), The Calendar of the Roman Republic, Princeton, ISBN 9781400849789 https://books.google.com/books?id=FgTWCgAAQBAJ
Schmitz (1842). - Schmitz, Leonhard (1842), "Nu'ndinae", in Smith, William (ed.), A Dictionary of Greek and Roman Antiquities, London: Taylor & Walton, p. 648 https://books.google.com/books?id=-XZqkmmiFWUC&pg=PA648
Struck (2009), "Internundinum". - Struck, Peter T. (2009), "Dictionary", Greek & Roman Mythology, Philadelphia: University of Pennsylvania http://www.classics.upenn.edu/myth/php/tools/dictionary.php?method=browse
"nundine, n.", Oxford English Dictionary, Oxford: Oxford University Press.
The equivalent etymology from novem ("nine") and diēs ("day") is given by Festus.[6] https://en.wiktionary.org/wiki/novem#Latin
"nundine, n.", Oxford English Dictionary, Oxford: Oxford University Press.
Cornelius Labeo, Fastorum Libri, Book I, cited in Macrobius.[7][8] /wiki/Cornelius_Labeo
Macrobius, Book I, Ch. xvi, §28. - Macrobius, Saturnaliorum Libri VII (in Latin) https://penelope.uchicago.edu/Thayer/L/Roman/Texts/Macrobius/Saturnalia/1*.html
Kaster (2011), p. 199. - Macrobius (2011), Kaster, Robert A. (ed.), Saturnalia, Vol. I, Loeb Classical Library, No. 510 (in English and Latin), Cambridge: Harvard University Press, ISBN 9780674996496 https://www.loebclassics.com/view/macrobius-saturnalia/2011/pb_LCL510.3.xml
Julius Modestus, Quaestiones Confusae, cited in Macrobius.[10][11] /wiki/Julius_Modestus
Kennedy (1879), p. 126. - Kennedy, Benjamin Hall (1879), The Public School Latin Grammar, London: Longmans, Green, & Co., ISBN 9781177808293 https://books.google.com/books?id=tVruAgAAQBAJ
"nundine, n.", Oxford English Dictionary, Oxford: Oxford University Press.
Ker (2010), pp. 382. - Ker, James (2010), "Nundinae: The Culture of the Roman Week", Phoenix, Vol. 64, No. 3, Classical Association of Canada, pp. 360–385
Michels (1967), p. 202. - Michels, Agnes Kirsopp Lake (1967), The Calendar of the Roman Republic, Princeton, ISBN 9781400849789 https://books.google.com/books?id=FgTWCgAAQBAJ
Schmitz (1842). - Schmitz, Leonhard (1842), "Nu'ndinae", in Smith, William (ed.), A Dictionary of Greek and Roman Antiquities, London: Taylor & Walton, p. 648 https://books.google.com/books?id=-XZqkmmiFWUC&pg=PA648
Schmitz (1842). - Schmitz, Leonhard (1842), "Nu'ndinae", in Smith, William (ed.), A Dictionary of Greek and Roman Antiquities, London: Taylor & Walton, p. 648 https://books.google.com/books?id=-XZqkmmiFWUC&pg=PA648
Macrobius, Book I, Ch. xv, §13. - Macrobius, Saturnaliorum Libri VII (in Latin) https://penelope.uchicago.edu/Thayer/L/Roman/Texts/Macrobius/Saturnalia/1*.html
Kaster (2011), p. 181. - Macrobius (2011), Kaster, Robert A. (ed.), Saturnalia, Vol. I, Loeb Classical Library, No. 510 (in English and Latin), Cambridge: Harvard University Press, ISBN 9780674996496 https://www.loebclassics.com/view/macrobius-saturnalia/2011/pb_LCL510.3.xml
Macrobius, Book I, Ch. xv, §12. - Macrobius, Saturnaliorum Libri VII (in Latin) https://penelope.uchicago.edu/Thayer/L/Roman/Texts/Macrobius/Saturnalia/1*.html
Kaster (2011), p. 181. - Macrobius (2011), Kaster, Robert A. (ed.), Saturnalia, Vol. I, Loeb Classical Library, No. 510 (in English and Latin), Cambridge: Harvard University Press, ISBN 9780674996496 https://www.loebclassics.com/view/macrobius-saturnalia/2011/pb_LCL510.3.xml
Dion. Hal., Book II, Ch. xxviii, §3. - Dionysius of Halicarnassus, Ῥωμαϊκὴ Ἀρχαιολογία [Rhōmaïkē Arkhaiología] (in Ancient Greek)
Cary (1937), Vol. I, p. 395. - Dionysius of Halicarnassus (1937), Cary, Ernest (ed.), Roman Antiquities, Loeb Classical Library, Cambridge: Harvard University Press https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Dionysius_of_Halicarnassus/home.html
Tuditanus, cited by Macrobius.[20][8] /wiki/Sempronius_Tuditanus
Cassius Hemina, cited by Macrobius.[22][8] /wiki/Lucius_Cassius_Hemina
Geminus and Varro,[24] cited by Macrobius.[22][25] /wiki/Geminus
Macrobius, Vol. I, Ch. xiii, §18. - Macrobius, Saturnaliorum Libri VII (in Latin) https://penelope.uchicago.edu/Thayer/L/Roman/Texts/Macrobius/Saturnalia/1*.html
Kaster (2011), p. 163. - Macrobius (2011), Kaster, Robert A. (ed.), Saturnalia, Vol. I, Loeb Classical Library, No. 510 (in English and Latin), Cambridge: Harvard University Press, ISBN 9780674996496 https://www.loebclassics.com/view/macrobius-saturnalia/2011/pb_LCL510.3.xml
Schmitz (1842). - Schmitz, Leonhard (1842), "Nu'ndinae", in Smith, William (ed.), A Dictionary of Greek and Roman Antiquities, London: Taylor & Walton, p. 648 https://books.google.com/books?id=-XZqkmmiFWUC&pg=PA648
Gellius, xx, l, §49. - Gellius, Attic Nights (in Latin) http://data.perseus.org/texts/urn:cts:latinLit:phi1254.phi001
Granius, Hist., Book II, cited by Macrobius.[30][8] /wiki/Granius_Licinianus
Struck (2009), "Nundinae". - Struck, Peter T. (2009), "Dictionary", Greek & Roman Mythology, Philadelphia: University of Pennsylvania http://www.classics.upenn.edu/myth/php/tools/dictionary.php?method=browse
Macrobius, Book I, Ch. xiii, §17. - Macrobius, Saturnaliorum Libri VII (in Latin) https://penelope.uchicago.edu/Thayer/L/Roman/Texts/Macrobius/Saturnalia/1*.html
Kaster (2011), p. 163. - Macrobius (2011), Kaster, Robert A. (ed.), Saturnalia, Vol. I, Loeb Classical Library, No. 510 (in English and Latin), Cambridge: Harvard University Press, ISBN 9780674996496 https://www.loebclassics.com/view/macrobius-saturnalia/2011/pb_LCL510.3.xml
Holleran (2012), p. 186. - Holleran, Claire (2012), Shopping in Ancient Rome: The Retail Trade in the Late Republic and the Principate, Oxford: Oxford University Press, ISBN 9780199698219 https://books.google.com/books?id=oO7NwmbyxwAC
Cicero, Epistulae ad Atticum, Book I, Ep. xiv, §1. - Cicero, Epistulae ad Atticum (in Latin)
Schmitz (1842). - Schmitz, Leonhard (1842), "Nu'ndinae", in Smith, William (ed.), A Dictionary of Greek and Roman Antiquities, London: Taylor & Walton, p. 648 https://books.google.com/books?id=-XZqkmmiFWUC&pg=PA648
Cass. Dio, Book XLVIII, Ch. xxxiii. - Cassius Dio, Ῥωμαϊκὴ Ἱστορία [Rhōmaïkē Historía] (in Latin)
Holleran (2012), p. 186. - Holleran, Claire (2012), Shopping in Ancient Rome: The Retail Trade in the Late Republic and the Principate, Oxford: Oxford University Press, ISBN 9780199698219 https://books.google.com/books?id=oO7NwmbyxwAC
Holleran (2012), p. 53. - Holleran, Claire (2012), Shopping in Ancient Rome: The Retail Trade in the Late Republic and the Principate, Oxford: Oxford University Press, ISBN 9780199698219 https://books.google.com/books?id=oO7NwmbyxwAC
Suetonius, Aug, Ch. 92, §2. - Suetonius, The Life of Augustus (in Latin) https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Suetonius/12Caesars/Augustus*.html
Ker (2010), pp. 381–2. - Ker, James (2010), "Nundinae: The Culture of the Roman Week", Phoenix, Vol. 64, No. 3, Classical Association of Canada, pp. 360–385
Brind'Amour (1983), pp. 256–275. - Brind'Amour, P. (1983), Le Calendrier Romain: Recherches Chronologiques (in French), Ottawa, ISBN 2760347028 https://archive.org/details/lecalendrierroma0000brin
Holleran (2012), p. 186. - Holleran, Claire (2012), Shopping in Ancient Rome: The Retail Trade in the Late Republic and the Principate, Oxford: Oxford University Press, ISBN 9780199698219 https://books.google.com/books?id=oO7NwmbyxwAC
Ker (2010), p. 364. - Ker, James (2010), "Nundinae: The Culture of the Roman Week", Phoenix, Vol. 64, No. 3, Classical Association of Canada, pp. 360–385
Struck (2009), "Nundinae". - Struck, Peter T. (2009), "Dictionary", Greek & Roman Mythology, Philadelphia: University of Pennsylvania http://www.classics.upenn.edu/myth/php/tools/dictionary.php?method=browse
Benefiel (2016), p. 443. - Benefiel, Rebecca R. (2016), "Regional Interaction", A Companion to Roman Italy, Malden: John Wiley & Sons, pp. 441–458, ISBN 9781118993118 https://books.google.com/books?id=bChcCwAAQBAJ&pg=PA441
Struck (2009), "Nundinae". - Struck, Peter T. (2009), "Dictionary", Greek & Roman Mythology, Philadelphia: University of Pennsylvania http://www.classics.upenn.edu/myth/php/tools/dictionary.php?method=browse
Francese (2007). - Francese, Christopher (2007), "Nundinae", Ancient Rome in So Many Words, Conshohocken: K & P Publishing, pp. 77, ISBN 978-0-7818-1153-8 https://books.google.com/books?id=gl5T47CvuDsC&pg=PA77
Francese (2007). - Francese, Christopher (2007), "Nundinae", Ancient Rome in So Many Words, Conshohocken: K & P Publishing, pp. 77, ISBN 978-0-7818-1153-8 https://books.google.com/books?id=gl5T47CvuDsC&pg=PA77
Struck (2009), "Nundinae". - Struck, Peter T. (2009), "Dictionary", Greek & Roman Mythology, Philadelphia: University of Pennsylvania http://www.classics.upenn.edu/myth/php/tools/dictionary.php?method=browse
Varro, Saturarum, Book l, l. 186. - Varro, Saturarum Menippearum Libri CL (in Latin)
Seneca, Ad Luc., Ep. 86, §12. - Seneca, Epistulae Morales ad Lucilium (in Latin)
Ker (2010), p. 369–370. - Ker, James (2010), "Nundinae: The Culture of the Roman Week", Phoenix, Vol. 64, No. 3, Classical Association of Canada, pp. 360–385
Pliny, Hist. Nat., Book XXVIII, Ch. v, §28. - Pliny, Historia Naturalis (in Latin) https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Pliny_the_Elder/home.html
Pliny & Bostock (1855), Book XXVIII, Ch. v. - Pliny (1855), Bostock, John (ed.), The Natural History, London: Taylor & Francis
Ker (2010), p. 367. - Ker, James (2010), "Nundinae: The Culture of the Roman Week", Phoenix, Vol. 64, No. 3, Classical Association of Canada, pp. 360–385
Schmitz (1842). - Schmitz, Leonhard (1842), "Nu'ndinae", in Smith, William (ed.), A Dictionary of Greek and Roman Antiquities, London: Taylor & Walton, p. 648 https://books.google.com/books?id=-XZqkmmiFWUC&pg=PA648
Dion. Hal., Book II, Ch. xxviii, §3. - Dionysius of Halicarnassus, Ῥωμαϊκὴ Ἀρχαιολογία [Rhōmaïkē Arkhaiología] (in Ancient Greek)
Cary (1937), Vol. I, p. 395. - Dionysius of Halicarnassus (1937), Cary, Ernest (ed.), Roman Antiquities, Loeb Classical Library, Cambridge: Harvard University Press https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Dionysius_of_Halicarnassus/home.html
Ker (2010), p. 370. - Ker, James (2010), "Nundinae: The Culture of the Roman Week", Phoenix, Vol. 64, No. 3, Classical Association of Canada, pp. 360–385
Schmitz (1842). - Schmitz, Leonhard (1842), "Nu'ndinae", in Smith, William (ed.), A Dictionary of Greek and Roman Antiquities, London: Taylor & Walton, p. 648 https://books.google.com/books?id=-XZqkmmiFWUC&pg=PA648
Schmitz (1842). - Schmitz, Leonhard (1842), "Nu'ndinae", in Smith, William (ed.), A Dictionary of Greek and Roman Antiquities, London: Taylor & Walton, p. 648 https://books.google.com/books?id=-XZqkmmiFWUC&pg=PA648
Dion. Hal., Book VII, Ch. lviii. - Dionysius of Halicarnassus, Ῥωμαϊκὴ Ἀρχαιολογία [Rhōmaïkē Arkhaiología] (in Ancient Greek)
Cary (1937), Vol. IV, p. 317. - Dionysius of Halicarnassus (1937), Cary, Ernest (ed.), Roman Antiquities, Loeb Classical Library, Cambridge: Harvard University Press https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Dionysius_of_Halicarnassus/home.html
Festus, "Nundinas". - Festus, De Verborum Significatione Libri XX (in Latin)
Ker (2010), pp. 366–7. - Ker, James (2010), "Nundinae: The Culture of the Roman Week", Phoenix, Vol. 64, No. 3, Classical Association of Canada, pp. 360–385
Ker (2010), p. 366. - Ker, James (2010), "Nundinae: The Culture of the Roman Week", Phoenix, Vol. 64, No. 3, Classical Association of Canada, pp. 360–385
Struck (2009), "Nundinae". - Struck, Peter T. (2009), "Dictionary", Greek & Roman Mythology, Philadelphia: University of Pennsylvania http://www.classics.upenn.edu/myth/php/tools/dictionary.php?method=browse
Caesar, Auspices, Book XVI, cited in Macrobius.[7][8] /wiki/Julius_Caesar
Ker (2010), p. 366. - Ker, James (2010), "Nundinae: The Culture of the Roman Week", Phoenix, Vol. 64, No. 3, Classical Association of Canada, pp. 360–385
Trebatius, De Religionibus, cited in Macrobius.[10][8] /wiki/Gaius_Trebatius_Testa
Macrobius. - Macrobius, Saturnaliorum Libri VII (in Latin) https://penelope.uchicago.edu/Thayer/L/Roman/Texts/Macrobius/Saturnalia/1*.html
Cicero, in his speeches[59][60][61][62] and letters.[63][64] /wiki/Cicero
Livy, Book III, Ch. 35. - Livy, History of Rome (in Latin) https://www.thelatinlibrary.com/liv.html
Dion. Hal., Book IX, Ch. xli. - Dionysius of Halicarnassus, Ῥωμαϊκὴ Ἀρχαιολογία [Rhōmaïkē Arkhaiología] (in Ancient Greek)
Cary (1937), Vol. VI, p. 59. - Dionysius of Halicarnassus (1937), Cary, Ernest (ed.), Roman Antiquities, Loeb Classical Library, Cambridge: Harvard University Press https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Dionysius_of_Halicarnassus/home.html
Francese (2007). - Francese, Christopher (2007), "Nundinae", Ancient Rome in So Many Words, Conshohocken: K & P Publishing, pp. 77, ISBN 978-0-7818-1153-8 https://books.google.com/books?id=gl5T47CvuDsC&pg=PA77
Plutarch, Ch. 42. - Plutarch, "Αἴτια Ῥωμαϊκά [Aítia Rhōmaïká]", Ἠθικά [Ethiká], Book IV, §20 (in Latin)
Babbitt (1936), p. 74. - Plutarch (1936), "Roman Questions", in Babbitt, Frank Cole (ed.), Moralia, Vol. IV, Loeb Classical Library, Cambridge: Harvard University Press https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Plutarch/Moralia/Roman_Questions*/home.html
Granius, Hist., Book II, cited by Macrobius.[30][8] /wiki/Granius_Licinianus
Ker (2010), p. 363. - Ker, James (2010), "Nundinae: The Culture of the Roman Week", Phoenix, Vol. 64, No. 3, Classical Association of Canada, pp. 360–385
Cass. Dio, Book XL, Ch. xlvii. - Cassius Dio, Ῥωμαϊκὴ Ἱστορία [Rhōmaïkē Historía] (in Latin)
Cass. Dio, Book XLVIII, Ch. xxxiii. - Cassius Dio, Ῥωμαϊκὴ Ἱστορία [Rhōmaïkē Historía] (in Latin)
Macrobius, Book I, Ch. xiii, §19. - Macrobius, Saturnaliorum Libri VII (in Latin) https://penelope.uchicago.edu/Thayer/L/Roman/Texts/Macrobius/Saturnalia/1*.html
Kaster (2011), pp. 163 & 165. - Macrobius (2011), Kaster, Robert A. (ed.), Saturnalia, Vol. I, Loeb Classical Library, No. 510 (in English and Latin), Cambridge: Harvard University Press, ISBN 9780674996496 https://www.loebclassics.com/view/macrobius-saturnalia/2011/pb_LCL510.3.xml
Ker (2010), p. 365. - Ker, James (2010), "Nundinae: The Culture of the Roman Week", Phoenix, Vol. 64, No. 3, Classical Association of Canada, pp. 360–385
Ovid, Book I, l. 58. - Ovid, Fastorum Libri VI (in Latin) http://www.gutenberg.org/ebooks/8738
Kline (2004), Book I, Introduction. - Ovid (2004), Kline, Anthony S. (ed.), On the Roman Calendar, Poetry in Translation http://www.poetryintranslation.com/PITBR/Latin/Fastihome.htm
Göttling (1840), p. 183. - Göttling, Karl Wilhelm (1840), Geschichte der römischen Staatsverfassung von Erbauung der Stadt bis zu C. Cäsar’s Tod, Halle: Verlag der Buchhandlung des Waisenhauses
Snyder (1936). - Snyder, Walter F. (1936), "Quinto Nundinas Pompeis", The Journal of Roman Studies, Vol. 26, No. 1, pp. 12–18
Ker (2010), p. 377. - Ker, James (2010), "Nundinae: The Culture of the Roman Week", Phoenix, Vol. 64, No. 3, Classical Association of Canada, pp. 360–385
Ker (2010), p. 380. - Ker, James (2010), "Nundinae: The Culture of the Roman Week", Phoenix, Vol. 64, No. 3, Classical Association of Canada, pp. 360–385
Francese (2007). - Francese, Christopher (2007), "Nundinae", Ancient Rome in So Many Words, Conshohocken: K & P Publishing, pp. 77, ISBN 978-0-7818-1153-8 https://books.google.com/books?id=gl5T47CvuDsC&pg=PA77
Ker (2010), p. 377. - Ker, James (2010), "Nundinae: The Culture of the Roman Week", Phoenix, Vol. 64, No. 3, Classical Association of Canada, pp. 360–385
Holleran (2012), p. 184. - Holleran, Claire (2012), Shopping in Ancient Rome: The Retail Trade in the Late Republic and the Principate, Oxford: Oxford University Press, ISBN 9780199698219 https://books.google.com/books?id=oO7NwmbyxwAC
Francese (2007). - Francese, Christopher (2007), "Nundinae", Ancient Rome in So Many Words, Conshohocken: K & P Publishing, pp. 77, ISBN 978-0-7818-1153-8 https://books.google.com/books?id=gl5T47CvuDsC&pg=PA77
Francese (2007). - Francese, Christopher (2007), "Nundinae", Ancient Rome in So Many Words, Conshohocken: K & P Publishing, pp. 77, ISBN 978-0-7818-1153-8 https://books.google.com/books?id=gl5T47CvuDsC&pg=PA77
Cass. Dio, Book LX, Ch. xxiv. - Cassius Dio, Ῥωμαϊκὴ Ἱστορία [Rhōmaïkē Historía] (in Latin)
The details of such interference with the nundinal cycle are unclear but, e.g., it is thought that the nundinae were moved by a day if one occurred on Regifugium, the festival celebrating the flight of the last Roman king. This could occur every three years. /wiki/Regifugium