Rothesay Castle is a ruined castle in the town of Rothesay, Isle of Bute, Scotland (Scottish Gaelic: Baile Bhòid,Eilean Bhòid or An t-Eilean Bòdach, Alba). It dates to the early 13th-century and is thought to have been built by either Alan fitz Walter, Steward of Scotland (1140 – 1204), or by his son Walter Steward of Dundonald (died 1246). The castle is known for its close links with the Stewarts. They were hereditary high stewards and, from 1371, a royal dynasty. Major works were undertaken on Rothesay Castle in the later 1400s and early 1500 by James IV and James V. Rothesay then fell into ruins and was restored only in the 1800s, by the Crichton Stuarts, as keepers of the castle. The castle comprises a large curtain wall, with four round towers, together with a 16th-century forework. It is surrounded by a broad moat.