Built in 1193 by the Anglo-Norman Pipard family atop the ancient capital of the pre-Christian Gaelic kingdom of Airgíalla near Carrickmacross, a deliberate symbolic act of conquest. Excavations of the 12.5-metre motte have uncovered medieval pottery and ironworking tools; the stone keep ruins remain visible today on what is now Mannan Castle Golf Club land.
Visiting Mannan Castle (in ruins)
Yes, National Monument, publicly accessible
Where to stay nearby
The closest castle hotel is Cabra Castle, 14.93 km away in Kingscourt — Built in 1795 on the site of an earlier round-tower castle (Cormey Castle), constructed in a mix of neo-Norman and Gothick styles.