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Vortigern , also spelled Vortiger and Vortigen, was possibly a 5th-century warlord in Britain, known perhaps as a king of the Britons. His existence is contested, and information about him is obscure.

Detail from Lambeth Palace Library MS 6 folio 43v illustrating an episode in Geoffrey of Monmouth's Historia Regum Britanniae (c. 1136) in which Vortigern meets the young Merlin, who explains that an underground fight between red and white dragons is causing Vortigern's fortress to collapse.

Vortigern (/ˈvɔːrtɜːrn/; Old Welsh Guorthigirn, Guorthegern; Welsh: Gwrtheyrn; Old English: Wyrtgeorn; Old Breton Gurdiern, Gurthiern; Irish: Foirtchern), also spelled Vortiger and Vortigen, was possibly a 5th-century warlord in Britain, known perhaps as a king of the Britons. His existence is contested, and information about him is obscure.

He may have been the "superbus tyrannus" said to have invited Hengist and Horsa to aid him in fighting the Picts and the Scots. However, they revolted, killing his son in the process and forming the Kingdom of Kent. It is said that he took refuge in North Wales, and that his grave was in Dyfed or the Llŷn Peninsula. He is cited at the beginning of the genealogy of the early Kings of Powys.