Ursula Flint

Ursula Flint was a pure-blood witch and the wife of Phineas Nigellus Black, a headmaster of Hogwarts School of Witchcraft and Wizardry. The couple had five children: Sirius, Phineas, Cygnus, Belvina, and Arcturus Black. Phineas was disowned for supporting Muggle rights, going against his family's belief in pure-blood supremacy. Through her other children, Ursula is an ancestor of many pure-blood witches and wizards in Britain.

Etymology
The name Ursula means "little bear", derived from the Latin word ursa, "she-bear", which gives its name to two constellations associated with the Greek myth of Callisto, a nymph who was turned into a bear. Saint Ursula was a legendary Roman-British princess who was martyred by the Huns while returning from a pilgrimage in the fourth century.

Behind the scenes
Ursula Flint may be related to Marcus Flint, captain of the Slytherin Quidditch team during the early years of the 1990s.