 According to Geoffrey, Hafren 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").In Geoffrey of Monmouth's "Historia regum Britanniae" (History of the Kings of Britain, ), was the beautiful daughter of King Locrin of the Britons by his secret lover, a Germanic princess named Estrildis.Her mother had been abducted by Humber the Hun and brought to Britain during their invasion following King Brutus' death; eventually the Hun invasion was suppressed by Locrin, Brutus' eldest son, who fell in love with Estrildis upon discovering her in one of Humber's ships.