Dunboy Castle (Irish: Caisleán Dhún Baoi) is a castle on the Beara Peninsula in south-west Ireland near the town of Castletownbere. It was a stronghold of the O'Sullivan Bere, a Gaelic clan leader and 'Chief of Dunboy', and was built to guard and defend the harbour of Berehaven. Its presence enabled O'Sullivan Bere to control the sea fisheries off the Irish coast and collect sizeable taxes from Irish and Continental fishing vessels sheltering in the haven.
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