Sirius Black was James Potter's friend and Harry Potter's godfather.
He was the only member of the Black family to be placed in a house that wasn't Gryffindor. His parents disowned him when he was sixteen and he went to live with James Potter.
He was originally named Lily and James' secret keeper but persuaded them to change to Peter Pettigrew at the last moment as he believed himself to be the obvious choice, however they neglected to tell Albus Dumbledore which is why Sirius was imprisoned after Peter Pettigrew betrayed them. He was also believed to have killed thirteen muggles along with Peter but it was actually Peter who blew up the street and faked his own death.
Sirius escaped from Azkaban in Harry Potter and the Prisoner of Azkaban and was the first person who ever managed to do so. Nobody knew how he managed it until Harry learned that he was an unregistered Animagus which allowed him to slip through the bars and swim to shore in the form of a dog.
When he escaped it was believed that he was trying to kill Harry Potter but he was attempting to protect him from Peter who he had seen on Ron Weasley's shoulder in a picture. Sirius, aided by Remus Lupin, explains the truth to Harry and forces Peter out of hiding. However they are caught and Harry and Hermione are forced to go back in time to save him from the dementors kiss.
When Lord Voldemort rose to power he offered his family house as Headquarters because it was heavily guarded. He became frustrated at never having his name cleared and not being allowed to leave the house. Lord Voldemort used Sirius to lure Harry to the ministry, Sirius along with others than came to help which resulted in his death.
He was killed by his cousin, Bellatrix Lestrange, in the Department of Mysteries in 1995. His name was cleared after this. His death marked the end of the Black family as all other descendants were females.
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He is played by Will Dunn.
* Please note this is Harry's son. His father is James Potter.
Sirius Black is a fictional character who doesn't exist in real life.
The actor who portrayed him was Gary Oldman.
Sirius Black from Harry Potter real name is Gary Oldman.
Sirius Black.
Harry Potter's father is James Potter and Arthur Weasley is his father-in-law. He was raised by his mothers sister and her husband, Petunia and Vernon and Aunt Petunia Dursley His godfather was Sirius Black.
Gary Oldman, he played the main cop in the dark knight and sirius black in harry potter
Mcgonagle, James potter, Sirius Black, Peter Pettigrew, And the rest are in the third book (Harry potter and the prsoner of azkaban)