Estrildis

In Geoffrey of Monmouth's pseudo-historical narrative (12th century) Estrildis is introduced as the daughter of a king in Germania who is captured during Humber the Hun's invasion and brought to Britain aboard Humber's ships. Locrinus (a son of Brutus's line) discovers her among the captives and secretly keeps her as his mistress, visiting her for seven years while she is hidden in a cave beneath Trinovantum (London) and tended by servants. After the death of Corineus, Locrinus repudiates his lawful wife Gwendolen and publicly marries Estrildis, legitimising their daughter Habren/Sabrina; Gwendolen retaliates, defeats Locrinus, and has Estrildis and her daughter drowned in the river afterward named Hafren (Sabrina/Severn). The account functions as a literary and etiological episode in Geoffrey's Historia Regum Britanniae and later adaptations.

The extant sources supply no detailed physical description beyond generic praise: late summaries describe her as a 'beautiful Germanic princess.' Medieval chronicles and later retellings do not provide sustained iconographic or feature-level details (clothing, heraldry, precise physiognomy) for Estrildis beyond her status as foreign-born nobility and her attractiveness as a royal consort.

Estrildis is portrayed as a human actor rather than a supernatural agent; the sources attribute no magical abilities or powers. Her notable behaviours and narrative functions are political and social: she is taken captive from Germania, hidden for seven years beneath Trinovantum while Locrinus secretly visits her, bears Locrinus a daughter (Habren/Sabrina), is elevated to queen after Corineus's death when Locrinus abandons his earlier marriage, and ultimately becomes a passive victim of Gwendolen's revenge when she and her daughter are drowned. The role assigned to Estrildis in the tradition is primarily etiological and moral rather than supernatural.