The article does not name the builder. A castle may have stood on the island by 1257, and the surviving stonework may date partly to the English occupation around 1300, which is also the infobox date. The five-story tower house, 36.5 by 31.5 feet (11.1 by 9.6 m), was added in the 14th or early 15th century. A curtain wall encloses a rectangular courtyard, and the Glassin Tower, a round tower with gunholes, dates to about 1550 or the early 16th century, since the text gives both.
Robert II granted it to the Douglases in 1390. Mary, Queen of Scots, was imprisoned there in 1567 and escaped in May 1568. Sir William Bruce bought the estate in 1675 and used the castle as a garden focal point.
The ruin has been in state care since 1939. Historic Environment Scotland manages it as a scheduled monument, reached by a small summer ferry from Kinross.
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