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Carrickfergus Castle is a Norman castle in Northern Ireland, situated in the town of Carrickfergus in County Antrim, on the northern shore of Belfast Lough. Besieged in turn by the Scots, Irish, English and French, the castle played an important military role until 1928 and remains one of the best preserved medieval structures in Ireland. It was strategically useful, with 3/4 of the castle perimeter surrounded by water (although in modern times only 1/3 is surrounded by water due to land reclamation). Today it is maintained by the Northern Ireland Environment Agency as a state care historic monument, at grid ref: J4143 8725.