Garagon, Garengan, Gorangon
King of the Cantii tribe in Kent.
Vortigern, who ruled Britain, invited Hengist to Britain to help against the Picts and Irish. For his help and Hengist’s daughter in marriage, Vortigern gave Gwyrangon’s lands (without his knowledge) to Hengist.
Sources
Historia Brittonum | Probably Nennius, early 9th century
Historia Regum Britanniae | Geoffrey of Monmouth, c. 1138
Roman de Brut | Wace, c. 1155
Brut | Layamon, late 12th century to mid-13th century