Castlepook, Medieval castle ruins in Doneraile, Ireland

Castlepook is a ruined Norman-style castle built around 1380 by the Synan family, standing 4 km north of Doneraile in the foothills of the Ballyhoura Mountains. Its walls are limestone, and the stone vaulted roof remains intact. A stone spiral staircase once occupied the southwest corner, but much of the smooth stone from stairs and window and door frames has been removed by vandals.

Castlepook was built around 1380 for the Synan (Ó Sionáin) family, a Norman-style castle of limestone in the foothills of the Ballyhoura Mountains north of Doneraile. The sources record no further owners or later events, so the ruin stands as the Synan family's surviving stonework.

The Irish name Caisleán an Phúca means "castle of the Púca", a shape-shifting spirit of Irish folklore, and the ruin keeps that name in the townland of Castlepook. The castle was raised for the Synan family, Gaelic Ó Sionáin, around 1380.

The site sits on private property and is difficult to access, so you should obtain permission beforehand and prepare for rough terrain. The best time to visit is during dry weather when the rocky ground is safer to traverse.

The Synan family paid an annual rent of one pound of pepper for the land from 1251 to 1541, an unusual fee maintained for nearly three centuries. This curious arrangement reveals how valuable exotic spices were in medieval times.