Begun by John de Courcy soon after his 1177 invasion of Ulster.

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. This impressive structure is one of the best-preserved medieval structures in Northern Ireland. It was built around 1177 by John de Courcy, after his invasion of Ulster, and served as a military stronghold for centuries. The castle has seen numerous expansions and modifications over the years, reflecting its continuous use through the ages for military purposes.

Carrickfergus Castle played a significant role in various historical events, including sieges and battles, particularly during the Anglo-Norman period, and was used as a garrison during both World War I and World War II. Today, it is a public tourist attraction, offering visitors a glimpse into Northern Ireland’s medieval past through its exhibits, which include historical displays, cannons, and other artifacts. The castle’s structure includes a mighty keep, outer walls, and a dock, providing a fascinating exploration experience for those interested in history and architecture.

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