“And even the renowned king Arthur himself was mortally wounded; and being carried thence to the isle of Avallon to be cured of his wounds, he gave up the crown of Britain to his kinsman Constantine, the son of Cador, duke of Cornwall.”
Bk. 11, ch. 2; p. 271.
Historia Regum Britanniae (History of the Kings of Britain)
Original
Set et inclitus ille rex Arturus letaliter vulneratus est qui illuc ad sananda vulnera sua in insulam Avallonis evectus, Constantino cognato suo, et filio Cadoris ducis Cornubie diadema Britannie concessit.
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Geoffrey of Monmouth 8
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