They refused to consort with Muggles or Muggle-borns, Squibs and blood traitors and even disowned Squib family members, such as Sirius' great-uncle Marius Black, and insisted that their family members only marry within respectable pure-blood classes because of these beliefs, they were forced to marry their own cousins. The Black family believed strongly in pure-blood elitism. Notably, however, only one Sirius (the subject's great-grandfather) left a line of descent, which ended with the youngest Sirius, as he did not have children. The names Cygnus, Arcturus, and Regulus have also occurred at least twice each. "Sirius" is a traditional Black family name, recurring in at least three generations and following a family tradition of naming children after stars, constellations, and galaxies. Sirius did not share a close relationship with his brother, calling him "a better son" than himself. Sirius had a younger brother, Regulus, who died after turning against Lord Voldemort in 1979 by attempting to destroy his Horcruxes he was killed by the Inferi guarding one of his Horcruxes (although Sirius did not know this). He was the last remaining heir of the House of Black, a once-notable pure-blood wizarding family. Sirius Black was born on 3 November, 1959, in the Islington Bourough of London, England, to Orion Black and Walburga Black, both of whom were Dark Wizards and second cousins. Sirius exposed Pettigrew's treachery to his old friend Remus and his godson, as well as to the entire Wizarding World when Pettigrew was captured by a pair of Aurors on Hogwarts Grounds on 6 June, 1994 after the interference of Harry and three school friends which brought the truth to light. Sirius was sent to Azkaban, and after twelve years became the only known person to escape the prison unassisted by transforming into his Animagus form of a massive black dog often confused with a "Grim", an omen said to cause death. However, Pettigrew was able to frame Sirius for his betrayal of the Potters, the murder of twelve Muggles, and the staged murder of Pettigrew before Sirius could accomplish this. When Pettigrew betrayed the Potters to Voldemort, Sirius sought to exact revenge on Pettigrew. Sirius was named the godfather of Harry James Potter, the only son of James and Lily Potter. The Marauders all joined the Order of the Phoenix to fight against Lord Voldemort and his Death Eaters during the First Wizarding War. In their sixth year, the Marauders, with the collective brilliance of Sirius and James, developed a map that showed anyone on Hogwarts grounds.
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Sirius became an animagus in his fifth year of schooling in order to support his friend, Remus Lupin, who was a werewolf, along with James and Peter. Together, they were collectively referred to as the Marauders. He met three great friends at Hogwarts- James Potter, Remus Lupin, and Peter Pettigrew. Sirius continued to be at odds with his parents throughout his youth. As the rest of his family had been in Slytherin, he was the odd one out. Although he was the heir of the House of Black, Sirius disagreed with his family's belief in blood purity and defied tradition when he was Sorted into Gryffindor House instead of Slytherin at Hogwarts School of Witchcraft and Wizardry, which he attended from 1971- 1978. Sirius Orion Black III (born 3 November, 1959) was an English pure-blood wizard, the older son of Orion and Walburga Black, and the brother of Regulus Black.