Hafren

Hafren was a legendary British princess who was drowned in the river Severn (Welsh: Hafren; Old Welsh: Habren) by her repudiated stepmother Gwendolen, as told by Geoffrey of Monmouth in his pseudohistorical chronicle Historia Regum Britanniae. According to Geoffrey, she is the eponym of the Severn, which bears one of Britain's most ancient river names (recorded as early as the 2nd century in the Latinized form Sabrina).