The then Lord of Mann, James, 7th Earl of Derby, had the fort on nearby St Michael's Isle (Fort Island) rebuilt in 1645 (Henry VIII built the original fort in 1540) to protect Derbyhaven from the parliamentarians in the English Civil War.
The Castletown Golf & Country Club (also a hotel) is set on the peninsula and the land connecting it with Derbyhaven and has been the scene of many international championships.
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The small community of Derbyhaven is situated on this strip of land which lies close to Castletown, Isle of Man.