Renwein (called Ronwen, Rowen, Rovent, Rowenne, Rowena and other similar forms, and named Sard(o)ine in Bauduins Butors’ Le Roman des fils du roi Constant) is Hengist’s daughter (except in the Vita Merlini where she is Hengist’s sister) whom Hengist gives King Vortigern in exchange for rulership over Kent.