gaol

Dated spelling of jail.

There's every Staffordshire crime-piece ever made in this cabinet, and that's unique. The Van Hoyer Museum in New York hasn't that very rare second version of Maria Marten's Red Barn over there, nor the little Frederick George Manning – he was the criminal Dickens saw hanged on the roof of the gaol in Horsemonger Lane, by the way —

There was a simple reason for Sirius' complete absence from Harry's life until then – Sirius had been in Azkaban, the terrifying wizard gaol guarded by creatures called Dementors, […]

Dated spelling of jail.