Ursula Black, née Flint (1848-1938) was a former School Matron of Hogwarts School of Witchcraft and Wizardry as well as the wife of Headmaster Phineas Nigellus Black and mother of Sirius, Phineas, Arcturus, Belvina and Cygnus.
Ursula went to Hogwarts from 1859 to 1866 and was sorted into Slytherin House, just like her husband and sons (Belvina was sorted into Hufflepuff). Ursula studied to become a Healer and started working at Hogwarts as a matron. She fell in love with and married Headmaster Black and they had five children whom they raised in Hogsmeade.
Ursula was a harsh woman but a loving mother. Although she strongly disapproved her son Phineas's behaviour, she thought he'd ought to be given a chance of redemption and never wanted any of her children to be banned from the family.
Ursula was a short and stout witch with a patato-like nose and a sweet smile.