A German princess captured and brought to England by King Humber (according to Geoffrey of Monmouth's History).
Locrine, king of Britain, fell in love with her and they had a daughter Habren (Sabrina). Locrine put aside his wife Gwendolen for her, but she exacted vengeance on him by pursuing and slaying him in battle and having Estrildis and her daughter drowned in the river Severn, thereafter named from the daughter. The story is treated in Lodge's ‘The Complaynt of Elstred’ (1593), in Spenser's Faerie Queene (ii. x), and in Swinburne's drama Locrine (1887).