He spent it at Hogwarts.
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In the third installment of harry potter harry sees himself near the lake. But at first he assumes that it is his father james potter. But then he realizes that it was none other than himself.
He left at the end of Harry Potter and the Prisoner of Azkaban.
The third one, which is Prisoner of Azkaban.
Michael Gambon is playing Prof. Dumbledore in the new Harry Potter film, Harry Potter and the Half-blood Prince.
Mcgonagle, James potter, Sirius Black, Peter Pettigrew, And the rest are in the third book (Harry potter and the prsoner of azkaban)