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The 'Castle of St. John' is an early 16th century L-plan tower house in the centre of Stranraer, in Dumfries and Galloway, southwest Scotland. It was built by the Adairs of Kilhilt. It has been used as a home, a court, a prison, and as a military garrison during the "Killing Times" of Covenanter persecution in the 1680s. The castle is now a museum.