Sirius Orion Black, a name often yelled by Walburga Black, the mother of the poor soul, attended Hogwarts School of Witchcraft and Wizardry. There, he met James Potter, a pureblood but a blood traitor, someone he was told not to even go near, as it was a disgrace to society. Remus Lupin, a half-blood with many scars around his body, another menace to society. And Peter Pettigrew, another disgrace to society but was tolerated by the Black household, since they were purebloods who still had standards for who their children were allowed to associate with. Naturally, Sirius became best friends with the lot.