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Trim Castle is a Norman castle on the south bank of the River Boyne in Trim, County Meath. With an area of 30,000 m², it is the largest Norman castle in Ireland. Over a period of 50 years, from 1172 to 1224, it was built by Hugh de Lacy and his son Walter as the seat of the Lordship of Meath.
One of the National Monuments of Ireland.
Wikipedia:Link

A National Monument in the Republic of Ireland is a structure or site, the preservation of which has been deemed to be of national importance and therefore worthy of state protection. If the land adjoining the monument is essential to protect it, this land may also be protected.
A list of the monuments can be found at Link