The only contemporary information about Vortiporius comes from the Welsh ecclesiastic Gildas, in a highly allegorical condemnation from his De Excidio et Conquestu Britanniae (English: "On the Ruin and Conquest of Britain").
At the time the work was written (c. 540), Gildas says that Vortiporius was king of Dyfed, that he was grey with age, that his wife had died, and that he had at least one daughter.
[2][3] As a legendary king in Geoffrey of Monmouth's 12th-century treatment of the Matter of Britain, the Historia Regum Britanniae, Vortiporius was the successor of Aurelius Conanus and was succeeded by Malgo.
[8] A memorial stone was discovered in 1895 near the church of Castell Dwyran in Carmarthenshire bearing a Christian cross and with inscriptions in both Latin and in ogham.
However, this assumption is refuted by modern linguistic analysis, which notes that the missing 'r' in the first syllable of 'Voteporigis'/'Votecorigas' is significant, and so the stone must be dedicated to a different person.
In his De Excidio et Conquestu Britanniae (English: On the Ruin and Conquest of Britain), written c. 540, Gildas makes an allegorical condemnation of 5 British kings by likening them to the beasts of the Christian Apocalypse as expressed in the biblical Book of Revelation, 13:2: the lion, leopard, bear, and dragon.
[11] In the course of his condemnations, Gildas makes passing reference to the other beasts mentioned in the Apocalypse, such as the eagle, serpent, calf, and wolf.
Protector (spelled here Protictoris, in the genitive) in the Latin inscription may imply a Roman-era honorific bestowed upon his ancestors, retained as a hereditary title into the 6th century.
He says that Uortiporius succeeded Aurelius Conan, and after he was declared king, the Saxons rose against him and brought over their countrymen from Germany in a great fleet, but that these were defeated.