He was accused of betraying his best friend, James Potter, and his wife, Lily Evans, to the Dark Lord Volvemort. He was blamed for the deaths of Peter Pettigrew and a bunch of muggles. He was said to be the right-hand man of Voldemort.
He was framed. Most of everyone in the wizarding world believed that he had murdered people. Peter Pettigrew had become the secret keeper for James and Lily when they had found out Voldemort was looking for them.
During The Purity War, Sirius Black was a member of The Order of The Phoenix and gave a confession to being a member of The Death Eaters, and betraying the Potters to The Dark Lady, admitting to putting the Imperius Curse on dozens of other Death Eaters. For his crimes, he was sentenced to Life in Azkaban Prison.
Dumbledore's lack of belief that Sirius is innocent is also suspect. Sirius was a member of the Order of the Phoenix which fought against Death Eaters, but Sirius also was as close to James as a brother, the Potters even took him in when he ran away from home.
Why did people think Sirius killed Harry's parents?
The Harry Potter and the Prisoner of Azkaban book showed that Sirius Black had been believed to be the one who betrayed James since the members of the Order of the Phoenix thought him to have been the Secret Keeper for the Fidelius Charm placed on the Potters' cottage in Godric's Hallow.
Why Dumbledore WANTED Sirius to ROT in Azkaban - Harry Potter Theory
Who actually betrayed the Potters?
However, they all learned the truth in 1994, when Pettigrew was exposed by Sirius Black and Remus Lupin; "Scabbers" was, in fact, Peter Pettigrew, the wizard who betrayed James and Lily Potter to Lord Voldemort.
Its not until lupin discovered that Peter P (wormtail) was still alive that Sirius was innocent and he did not portray the potters or kill wormtail. Therefore Mr weasley thought all along Sirius had the potters killed and though he was out to kill harry because he was the last potter and also he was his grandfather.
Goblet of Fire Cedric Diggory: Book: "Wands out, d'you reckon?" Movie: "Who are you, what do you want?" Order of the Phoenix Sirius Black: Book: "Come on, you can do better than that!" Movie: "Nice one, James!"
Did the Daily Prophet and Ministry admit that Sirius was innocent after his death? The Ministry absolutely did. Fudge admitted as much to the Muggle Prime Minister. When the latter asked whether Black, the only “DE” he'd been informed of in detail, had joined Voldemort.
Dumbledore told him. After the battle at the Department of Mysteries, Dumbledore and Fudge had a private chat. He told Fudge everything that happened from Voldy coming back and Harry wasn't actually lying and how to take precautions to protect the public and yes, that Sirius was innocent.
Why did everyone think Sirius betrayed the Potters?
Dumbledore, Remus, and everyone in on the plan was under the impression that Sirius was the secret keeper. The only possible way Voldemort could've accessed the Potters in order to kill them was if the secret keeper had revealed the information willingly, or else been coerced into doing so.
Sirius also disliked Regulus because of his ambition to become a Death Eater, but he was unaware that Regulus later attempted to destroy one of Voldemort's Horcruxes. Sirius regretted how young his brother died and wished Regulus hadn't been as soft to go with what their parents told him to do.
His help at the Ministry of Magic might result in a smoother mission. Thanks for A2A. No. Sirius had no idea that Harry was a Horcrux, and I think that is one of the kindest things that was done.
Overall, there is no doubt that Sirius was a complex man. However, he was, at his core, a person worthy of being looked up to. He knew right from wrong, was willing to take risks, could see the nuances of the world and was unafraid to love fiercely.
Sirius's early life proved unhappy; he had come to hate most of his relatives, in particular his mother. He rejected his family's pure-blood elitism and reverence for the Dark Arts.
Until the climax of Prisoner of Azkaban, Lupin believed Sirius Black was guilty of murdering 12 Muggles, betraying Lily and James Potter, and killing Peter Pettigrew. He eventually discovered the truth — that Sirius was innocent, and the very much alive Peter was the traitor.
No. We're told in the Karkaroff's trial scene that Voldemort kept the Death Eaters apart so that that none of them knew who all the others were. If you consider authorial intent, the purpose of that scene seems to be to establish why Snape didn't know Sirius was innocent.
He'd loved her, he really had. He'd also loved Sirius. He hadn't known that Sirius was in love with him too, not until his wedding day. As much as everything in James had ached to say 'I love you too, let's leave together', he hadn't been able to do that to Lily.
"... have mercy..." Lily Potter's death practically set in motion the wheels for the entire series. She died at her home in Godric's Hollow trying to protect infant Harry, whom Voldemort was hell-bent on murdering. Lily's last words were an ardent request to the Dark Lord to let her little boy live.
After Lord Voldemort returned in 1995, Sirius rejoined the Order. He was killed by his cousin Bellatrix Lestrange during the Battle of the Department of Mysteries and subsequently cleared of all charges by the Ministry of Magic, though it was too late for him to enjoy his freedom.
In the book, Hermione's last line is a rebuke to Ron, who's encouraging their kids to beat Draco's kids at school. She tells her husband, "Don't try to turn them against each other before they've even started school!"
Draco, who implies that he is aware of how Sirius Black was supposedly involved in the deaths of Harry's parents, also taunts Harry about the impending threat of Black: "If it was me, I'd want revenge. I'd hunt him down myself."
She did not. Till the end of Goblet of Fire, the only 'good guys' who knew Sirius Black was innocent were Albus Dumbledore, Remus Lupin, Harry Potter, Ron Weasley and Hermione Granger. Of course, Voldemort knew that Sirius was innocent and Peter Pettigrew was guilty.
