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Book three
Sirius Black has appeared first in the third book, The Prisoner Of Azkaban, of the Harry Potter series. In this book he was a main character, and was also a main character in the movie. The first mention of Sirius was when the Daily Prophet released the information that he was realeased from Azkaban. Harry did not yet know Sirius was his godfather, and therefore thought as everyone else that Sirius was a murderer. Sirius was not actually seen by Harry until the chapter in which Ron got taken by a big black dog, which turned out to be Sirius. His nickname then proceeded to be Snuffles, because the Ministry of Magic still searched for him.

Book four
In the fourth book, the Goblet of Fire, Sirius Black was just heard from by post, but was communicating with Harry frequently. Later on, Harry spoke to him through the fire. Sirius was always kept informed about anything strange that happened during Harry's fourth year. The first face to face meeting with Sirius was a weekend at Hogsmeade, where Sirius appeared as a dog, and lead them to a private spot where they could talk. Sirius was later seen at the end of the book, also in his animagus form, but then left Harry.

Book Five
During The Order Of The Phoenix, Sirius was again a secondary character, but seen more frequently because the Order of the Phoenix was reestablished. 