They are unique among the peoples that Ptolemy names in that their location is reliably known due to the way he named several readily identifiable physical features. His Novantarum Cheronesus is the Rhins of Galloway, and his Novantarum promontory is Corsewall Point or the Mull of Galloway. This pins the Novantae to that area. Ptolemy says that their towns were Locopibium and Rerigonium. As there were no towns as such in the area at that time, he was likely referring to native strong points such as duns or royal courts.
The Novantae disappear from the historical record after the end of the Roman occupation, as the name was beyond doubt the Roman name for the people who did not use it, with their territory supplanted by the kingdoms of Rheged and Gododdin. A kingdom called Novant appears in the medieval Welsh poem Y Gododdin, attributed to Aneirin. The poem commemorates the Battle of Catraeth, in which an army raised by Gododdin attempted an ill-fated raid on the Angles of Bernicia. The work elegises the various warriors who fought alongside the Gododdin, among them the "Three Chiefs of Novant" and their substantial retinue. This Novant is evidently related to the Novantae tribe of the Iron Age.
The result is that an 'error correction' to the sole legitimate historical reference (Ptolemy), made so that a fictional itinerary in De Situ Britanniae would seem more logical, is retained; and the sole legitimate historical reference is further 'corrected' by moving the Selgovae far from their only known location, greatly expanding Novantae territory in the process.
While Roy's historical work is largely ignored due to his unknowing reliance on a fraudulent source, his maps and drawings are untainted, and continue to be held in the highest regard.
Befitting the single historical mention of the Novantae by Ptolemy, many historians have largely included the Novantae im passim in their works, if they are mentioned at all. William Forbes Skene (Celtic Scotland, 1886) briefly relates their notice in Ptolemy, adding his conjectures as to the possible locations of towns, though not with any conviction. John Rhys (Celtic Britain, 1904) mentions the Novantae in passing, without any detailed discussion. Local Galwegian historians, writing histories of their own home territory, provide a similarly scant treatment.
More recent histories largely treat the Novantae in passing, but sometimes weave them into a story that is not supported by either Ptolemy's map or archaeological evidence, though they are consistently placed in Galloway. John Koch (Celtic Culture, 2005) doesn't discuss the Novantae directly, but associates their name with the Trinovantes of southeastern England, and provides a map showing the "Novant" occupying Galloway including Kirkcudbrightshire to accompany his discussion of the Gododdin. Barry Cunliffe, an archaeologist, (Iron Age Communities in Britain, 1971) mentions the Novantae in passing, saying their homeland was Galloway, and with a map showing it, which he attributes to "various sources". David Mattingly (An Imperial Possession: Britain in the Roman Empire, 2006) mentions them as a people of southwestern Scotland according to Ptolemy, with maps showing them as occupying ditto Galloway. Sheppard Frere (Britannia: A History of Roman Britain, 1987) mentions the Novantae several times in passing, associating them firmly with the Selgovae and sometimes with the Brigantes. He places them in Galloway, with the Selgovae on the other side of the Southern Uplands in southeastern Scotland. The Novantae is inconsequential to the larger history of Scotland in Before Scotland: The Story of Scotland Before History (2005) by Alistair Moffat, but he weaves a number of colourful though questionable details about them into his story. He says that their name means 'the Vigorous People', that they had kings and often acted in concert with the Selgovae and Brigantes, all of whom may have joined the Picts in raids on Roman Britain. He provides no authority for any of these assertions.
Rhys 1904:223, Celtic Britain - Rhys, John (1904), Celtic Britain (3rd ed.), London: Society for Promoting Christian Knowledge https://archive.org/stream/celticbritain03rhysgoog#page
Chisholm, Hugh, ed. (1911). "Kirkcudbrightshire" . Encyclopædia Britannica. Vol. 15 (11th ed.). Cambridge University Press. pp. 831–833, see page 832, para 4. History.—The country west of the Nith was originally peopled by a tribe of Celtic Gaels called Novantae, or Atecott Picts... /wiki/Hugh_Chisholm
Ries, Edward Grant (21 October 2010). "Scotland during the Roman Empire" (PDF). Electric Scotland. Retrieved 2016-09-27. https://www.electricscotland.com/books/ries/Scotland%20during%20the%20Roman%20Empire.pdf
Ptolemy c. 140, Geographia, Albion Island of Britannia. - Ptolemy (c. 140), "Book II, Chapter 2: Albion island of Britannia", in Thayer, Bill (ed.), Geographia, retrieved 2008-04-26 – via LacusCurtius website at the University of Chicago https://penelope.uchicago.edu/Thayer/E/Gazetteer/Periods/Roman/_Texts/Ptolemy/2/2*.html
Sassin 2008:419 - Sassin, Anne (2008). Snyder, Christopher A. (ed.). Early People of Britain and Ireland: An Encyclopedia, Volume II. Greenwood Publishing Group. ISBN 978-1-84645-029-7.
Frere 1987:88–89, 112–113, 130–131, 142–143, 347–348, Britannia - Frere, Sheppad Sunderland (1987), Britannia: A History of Roman Britain (3rd, revised ed.), London: Routledge & Kegan Paul, ISBN 0-7102-1215-1
Maxwell 1891:8–9, Roman Remains, A History of Dumfries and Galloway - Maxwell, Herbert (1891), A History of Dumfries and Galloway, Edinburgh: William Blackwood and Sons (published 1896) https://books.google.com/books?id=Sl0JAAAAIAAJ
M'Kerlie 1877:1–2, Wigtonshire. - M'Kerlie, Peter Handyside (1877), "General History", in M'Kerlie, Immeline M. H. (ed.), History of the Lands and Their Owners in Galloway With Historical Sketches of the District, vol. I (2nd ed.), Paisley: Alexander Gardner (published 1906) https://books.google.com/books?id=rV8JAAAAIAAJ
Harding 2004:62. Reports on the excavations were published in 1983. - Harding, Dennis William (2004), "The Borders and southern Scotland", The Iron Age in northern Britain: Celts and Romans, natives and invaders, Routledge, ISBN 0-415-30149-1 https://archive.org/details/ironageinnorther0000hard
Tacitus 1854:364–368, "Life of Agricola", Chapters 19 – 23. - Tacitus, Cornelius (1854) [98], "The Life of Cnaeus Julius Agricola", The Works of Tacitus (The Oxford Translation, Revised), vol. II, London: Henry G. Bohn, pp. 343–389 https://books.google.com/books?id=GMRJ5aWahRUC&pg=PA343
Sassin 2008:419 - Sassin, Anne (2008). Snyder, Christopher A. (ed.). Early People of Britain and Ireland: An Encyclopedia, Volume II. Greenwood Publishing Group. ISBN 978-1-84645-029-7.
Sassin 2008:419 - Sassin, Anne (2008). Snyder, Christopher A. (ed.). Early People of Britain and Ireland: An Encyclopedia, Volume II. Greenwood Publishing Group. ISBN 978-1-84645-029-7.
Skene 1868:380–381, XVIII, The Gododdin - Skene, William Forbes (1868), The Four Ancient Books of Wales, vol. I, Edinburgh: Edmonston and Douglas, pp. 380–381 https://books.google.com/books?id=xeEIAAAAQAAJ
Koch 1997:lxxxii–lxxxiii - Koch, John T., ed. (1997), The Gododdin of Aneirin: Text and Context from Dark-Age North Britain, University of Wales Press, ISBN 0-7083-1374-4
Roy 1790:115–119, Military Antiquities, Book IV, Chapter III - Roy, William (1790), "Military Antiquities of the Romans in North Britain", Digital Library, National Library of Scotland (published 2007), archived from the original on 2009-10-15, retrieved 2009-11-26 https://web.archive.org/web/20091015043340/http://www.nls.uk/maps/roy/antiquities/index.html
Cunliffe 1971:216 – see, for example, the influential Iron Age Communities in Britain, map of the tribes of Northern Britain, attributed to "various sources" - Cunliffe, Barry W. (1971), Iron Age Communities in Britain (4th ed.), Routledge (published 2005), p. 216, ISBN 0-415-34779-3
Skene 1886:72, Celtic Scotland - Skene, William Forbes (1886), Celtic Scotland: A History of Ancient Alban (History and Ethnology), vol. I (2nd ed.), Edinburgh: David Douglas, ISBN 9780836949766 https://books.google.com/books?id=_kcNAAAAIAAJ
Rhys 1904:222, 223, 227, 232, Celtic Britain - Rhys, John (1904), Celtic Britain (3rd ed.), London: Society for Promoting Christian Knowledge https://archive.org/stream/celticbritain03rhysgoog#page
Agnew 1891:1, 1 2, 10, 41, The Hereditary Sheriffs of Galloway - Agnew, Andrew (1891), Agnew, Constance (ed.), The Hereditary Sheriffs of Galloway, vol. I (2nd ed.), Edinburgh: David Douglas (published 1893) https://books.google.com/books?id=02NJAAAAMAAJ&pg=PR3
Maxwell 1891:2, 3, 4, 7, 10, 14, 23, A History of Dumfries and Galloway - Maxwell, Herbert (1891), A History of Dumfries and Galloway, Edinburgh: William Blackwood and Sons (published 1896) https://books.google.com/books?id=Sl0JAAAAIAAJ
M'Kerlie 1877:14, 15, 22–25, 27, 28, 31, 36, 71, History of the Lands and their Owners in Galloway - M'Kerlie, Peter Handyside (1877), "General History", in M'Kerlie, Immeline M. H. (ed.), History of the Lands and Their Owners in Galloway With Historical Sketches of the District, vol. I (2nd ed.), Paisley: Alexander Gardner (published 1906) https://books.google.com/books?id=rV8JAAAAIAAJ
M'Kerlie 1891:14–17, Galloway in Ancient and Modern Times, Ptolemy's Geography. - M'Kerlie, Peter Handyside (1891), Galloway in Ancient and Modern Times, Edinburgh: William Blackwood and Sons https://books.google.com/books?id=S51nAAAAMAAJ
Koch 2005:824, 825, 1689, Celtic Culture, Gododdin and Trinovantes. - Koch, John T., ed. (2005), Celtic Culture: A Historical Encyclopedia, ABL-CLIO (published 2006), ISBN 978-1-85109-440-0
Cunliffe 1971:215–216, Iron Age Communities in Britain, Southern Scotland: Votadini, Novantae, Selgovae and Damnonii. - Cunliffe, Barry W. (1971), Iron Age Communities in Britain (4th ed.), Routledge (published 2005), p. 216, ISBN 0-415-34779-3
Mattingly 2006:49, 148, 423, 425, An Imperial Possession: Britain in the Roman Empire - Mattingly, David (2006), An Imperial Possession: Britain in the Roman Empire, London: Penguin Books (published 2007), ISBN 978-0-14-014822-0 https://archive.org/details/imperialpossessi0000matt
Frere 1987:42, 90, 92, 93, 107, 111, 134, 355, Britannia - Frere, Sheppad Sunderland (1987), Britannia: A History of Roman Britain (3rd, revised ed.), London: Routledge & Kegan Paul, ISBN 0-7102-1215-1
Moffat 2005:212, 231, 248, 272, 275, 277, 279, 280, 302, 306, Before Scotland: The Story of Scotland Before History - Moffat, Alistair (2005), Before Scotland: The Story of Scotland Before History, New York: Thames and Hudson, ISBN 978-0-500-28795-8