Castleknock Castle

Castleknock Castle is a Norman fortification built on elevated ground west of Dublin, featuring deep defensive ditches and thick stone walls. The ruins are heavily covered in ivy and surrounded by mature trees that dominate the landscape.

Hugh Tyrrell, the first Baron of Castleknock, built this fortress in the 12th century to control western approaches to Dublin. The structure served as a key defensive position throughout the medieval period.

The castle grounds now function as a burial site for St. Vincent de Paul priests within the college premises. This blend of medieval fortress and modern religious community creates an unusual coexistence on the same land.

The ruins are located within a private boys' school grounds and are most visible during winter months when vegetation is sparser. Plan your visit for the colder season to see the structures more clearly as summer growth obscures the details.

A medieval stone burial chamber containing human remains was discovered beneath a large flat stone during excavation in 1861. This finding suggests the site held spiritual significance long before the Norman fortress was built.

Location: Fingal

GPS coordinates: 53.36820,-6.36600

Latest update: December 8, 2025 21:01