Bellatrix Black-Lestrange

Bellatrix Black-Lestrange is a cousin of Sirius Black(Padfoot). She is a Black family descendant. She have two sisters: Narcissa Black, who married a pure-blood wizard named Lucius Malfoy and has a son named Draco, the other sister is Andromeda Black, who married a muggle-born named Ted Tonks and has a daughter named Nymphadora, who married a werewolf named Remus Lupin(Moony), a friend of Sirius and Harry Potter's techer in Defense Against the Dark Arts during his third year in Hogwatrs School of Witchcraft & Wizardry.

She is senteced in Azkaban, a wizard prison, for using the Cruciatus Curse against Frank & Alice Longbottom, who are tortured by her to insanity, and are the parents of Neville Longbottom, who killed the snake Nagini and the Dark Lord, Lord Valdemort.