Cormac MacDermott owned the island in the 13th century. As the King of Moylurg, he was forced to defend the island when his castle was attacked by the 1st Baron of Connaught, Richard Mór de Burgh, in 1235 A.D.
De Burgh initially laid siege to McDermott's castle with fire ships, before using a raft-mounted catapult to destroy the castle walls and allow 500 mounted knights to invade. Ultimately, the McDermotts retained ownership until the 16th century.
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