Estrildis

or Estrild. Daughter of a German king, and handmaid to the mythical King Humber. When Humber was drowned in the river that bears his name, King Locrin fell in love with Estrildis, and would have married her, had he not been betrothed already to Guendolœʹna; however, he kept Estrildis for seven years in a palace under-ground, and had by her a daughter named Sabriʹna. After the death of Locrin, Guendalœʹna threw both Estrildis and Sabriʹna into the Severn. (Geoffrey: British History, ii. ch. ii.-v.)