The inscription was commissioned by Cyngen ap Cadell (died 855), king of Powys, in honour of his great-grandfather Elisedd ap Gwylog (reign 725–755), who is here claimed to be a descendant of "Britu son of Vortigern, whom Germanus blessed, and whom Sevira bore to him, daughter of Maximus the king, who killed the king of the Romans."
The Pillar of Eliseg inscription is the only known source for a daughter of Magnus Maximus specifically named Sevira (or Severa). However, Geoffrey Ashe noted in 1960 that "A letter of St. Ambrose gives us a scrap of information about [Maximus's] daughters. After his fall they were thrown on the charity of Theodosius, who magnanimously provided for their education." Both the number and the names of these daughters are unrecorded in surviving sources.
↑Bartrum, Peter C. (1993). "Severa daughter of Maximus". A Welsh Classical Dictionary; People In History And Legend Up To About A. D. 1000. Aberystwyth: National Library of Wales. p.672. Retrieved 8 April 2025.
↑Saint Ambrose (1881). "Letter XL, Ambrose to Theodosius, 388 AD". In Walford, Rev. H. (ed.). The Letters of S. Ambrose, Bishop of Milan. London: James Parker & Co. p.268. Retrieved 8 April 2025. [Y]ou have recalled the daughters of your enemy, you have committed them to be nurtured by their relative, you have bestowed money from your treasury on the mother of your enemy.
Bartrum, Peter C. "Severa daughter of Maximus", in A Welsh Classical Dictionary: People in History and Legend up to about A. D. 1000, p.236. National Library of Wales, 1993. Emended 2009, p.672.
Charles-Edwards, T. M., Wales and the Britons, 350-1064, Oxford University Press, Oxford, 2013, p.414ff.