Castle of St John

Castle of St John rises above Stranraer’s town centre as a remarkably intact 16th‑century tower house, built by the powerful Adair family. Its history is unusually varied: after serving as a noble residence, it became a military garrison, a prison and even a base for the notorious Covenanter persecutions. One striking fact is that prisoners once scratched messages into the castle’s walls, some of which can still be seen today, offering a rare human voice from a turbulent era. Inside, the castle’s layout reveals how status and defence were carefully balanced. The ground floor contains vaulted storage rooms, where supplies were kept behind thick stone walls. Climbing the spiral stair leads to the great hall, the social heart of the tower, with its large fireplace and traces of decorative plasterwork that hint at the Adairs’ ambitions. Upper chambers show how the family lived day to day, with narrow windows overlooking Loch Ryan and the town below. The parapet walk, accessible via the stair, gives a sense of the castle’s defensive role and provides one of the best viewpoints in Stranraer. Compact yet full of character, the Castle of St John offers an unusually complete journey through centuries of domestic life, conflict and local authority.