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Sirius told him, Ron and Hermionie in the Shrieking Shack, along with Remus Lupin and (forced sort of) Peter Pettigrew.

He learned a bit of it about Sirius being his godfather and he and James being friends by eavesdropping on Cornelius Fudge, Prof McGonagall and Hagrid on an illegal Hogsmeade trip.

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