Bellatrix "Bella" Lestrange (born 1951 – 2 May 1998) was a British pureblood witch, the eldest daughter of Cygnus and Drula Black, cousin of Regulus and Sirius Black, and older sister of Andromeda Tonks and Narcissaphoe. . He was a member of the Black House, an ancient wizarding family, and one of the twenty-eight saints. Bellatrix began her education at Hogwarts School of Witchcraft and Wizardry in the early sixties (either 1962 or 1963), and was sorted into Slytherin House.

 Bellatrix became a Death Eater after graduating from Hogwarts. He was fanatically loyal to Lord Voldemort and was one of his most dangerous and sadistic followers. All of the Black Sisters married pureblood wizards, except for Andromeda who married Muggle-born Ted Tonks and was disowned by her family.

 After Voldemort's fall from power, Bellatrix, her husband Rodolphus Lestrange, her brother-in-law Robastan Lestrange, and Barty Crouch Jr. captured and tortured Frank and Alice Longbottom, searching for information about Voldemort's whereabouts, which eventually led to the two be driven Four Death Eaters were arrested in Azkaban and sentenced to life imprisonment. Voldemort finally returned to full power in 1995, and Bellatrix, Rudolphus, and Rabastan escaped from Azkaban in 1996. , along with seven other Death Eaters.

 Bellatrix participated in several battles of the Second Wizarding War and made it a point to kill any relatives who were members of the Order of the Phoenix. He successfully killed two people, his cousin Sirius Black and his niece Nymphadora Tonks. He also killed a former Malfoy elf, Dobby, who had become Harry Potter's constant ally. During the final battle, Bellatrix was the last Death Eater standing. He was eventually killed in a duel by Molly Weasley after attempting to kill Ginny Weasley.

 Before her death, Bellatrix secretly gave birth to an illegitimate daughter named Delphine, who became pregnant with her beloved lord, Lord Voldemort. Delfini imagined some time after the Battle of the Department of Mysteries in 1996 and before the clash at Malfoy Manor in 1998.