Cullahill Castle, Medieval tower house ruins in County Laois, Ireland

Cullahill Castle is a five-story stone tower house standing near Cullahill village, with surviving walls that display original construction details and medieval building methods. The ruins showcase the compact, fortress-like design typical of Irish tower houses with thick masonry and narrow window openings.

The fortress was built in 1425 by the MacGillapatricks of Upper Ossory and faced severe attacks in 1441 from Kilkenny forces under King Henry VI's authority. During the Cromwell conflicts in the 17th century, cannon fire heavily damaged the northern section, creating lasting structural scars.

A Sheela na Gig is mounted on the outer wall behind the chimney of Cullahill Castle, not on the east wall. The carving is one of several such figures found on medieval Irish buildings, and its original purpose is not recorded in the sources. Across the road stand the ruins of the castle's private chapel, used by the Catholic lords of Upper Ossory.

The ruins are accessible via the R639 road and sit in open countryside, so visitors should prepare for changing weather conditions. A small chapel stands nearby that once served the residents and helps understand the broader context of the site.

The Sheela na Gig on the outer wall behind the chimney is easy to miss: it is a carved female figure set high on the masonry, a type of image found on medieval Irish churches and castles. Across the road stand the ruins of the castle's private chapel, used by the Catholic lords of Upper Ossory.