Sirius Black is the third member of the infamous, playful group called the "Marauders" (according to the popular term 'MWPP'). He, along with James Potter, Remus Lupin, Peter Pettigrew, Lily Evans, and many more
people went to Hogwarts, a school located in Scotland. He served as Best Man to James Potter's wedding (who married Lily Evans, incidentally) after Hogwarts. As well, he was wrongly accused for the murder of twelve Muggles and
one wizard. He was also thought to have betrayed the Potters to
Voldemort, a Dark
Wizard. As a result, he was sentenced to Azkaban, a wizarding prison. He broke out twelve years later, in his godson's third year at Hogwarts. Along with Harry Potter, Ron Weasley, Hermione Granger, and Remus Lupin, he attempted to procure Peter Pettigrew, the man who framed Sirius for the aforementioned crimes. However, the full
moon came, and sent Remus Lupin, a werewolf, into a frenzy. Peter Pettigrew got away, as a result, by changing into a
rat. Sirius Black was then recaptured, and he nearly had his soul sucked out by a dementor. He was saved, though; he then flew away on a Hippogriff.
For the next two years, Sirius remained in hiding. He served as a confidant to his godson, Harry Potter, through letters and secret meetings. In
Harry's fifth year, however, Sirius went to save
Harry in a battle against
Voldemort and some of his Death Eaters. Bellatrix Lestrange, a cousin of Sirius's as well as a Death Eater, sent a spell towards Sirius. As a result, he fell beyond a dark veil, where he is presumed to be dead.
