Sirius Black, also known as Padfoot or Snuffles (in his Animagus form) was a pure-blood wizard, the older son of Orion and Walburga Black, and the brother of Regulus Black. Although he was the heir of the House of Black, Sirius disagreed with his family's belief in blood purity. "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. The names Cygnus, Arcturus, and Regulus have also occurred at least twice each. 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 Black family believed strongly in pure-blood elitism. 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. They also held the Dark Arts in reverence. Sirius rejected these values, leading to conflict with his family. He even put permanent-sticking charms on Gryffindor banners, as well as pictures of Muggle girls in bikinis, and motorcycles, and a picture of himself and his Gryffindor friends on the walls of his room to emphasise his differences from the family and annoy his parents.[13] When his cousins Bellatrix and Narcissa made the desirable pure-blood marriages, to Rodolphus Lestrange and Lucius Malfoy respectively, Sirius held them in contempt. His favourite cousin, Andromeda, was disowned by the family as a "blood traitor" when she married Ted Tonks, a Muggle-born wizard. He 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. As the rest of his family had been in Slytherin, he was the odd one out. Hogwarts, like Harry, was his escape from the real world. Sirius' relationship with his relatives deteriorated, he gained a lifelong friendship with James Potter and Remus Lupin. Peter Pettigrew was a friend as well for ten years. The four friends were also known as the Marauders. The name is where the marauders' map came from as the Marauders made it.