Convicted of killing thirteen people with a single curse, he was said to be the heir apparent to the Dark Lord, Voldemort.
And the Azk For twelve long years, the dread fortress of Azkaban held an infamous prisoner named Sirius Black. Now he has escaped, leaving only two clues as to where he might be headed: Harry Potter's defeat of You-Know-Who was Black's downfall as well. For twelve long years, the dread fortress of Azkaban held an infamous prisoner named Sirius Black.