Castledermot Round Tower is a 10th-century round tower in Castledermot, County Kildare, Ireland. The tower, and the high crosses nearby, are a National Monument.BuildingThe tower is complete, although the original cap has been replaced with battlements. It is composed of rounded granite boulders embedded in mortar.HistoryCastledermot was founded as a monastic settlement c. 800 AD. The bishop-poet Cormac mac CuilennĂ¡in was buried here in AD 938 and the round tower was probably built around that time. The community ceased to exist some time after 1073.The crossesThere are two high crosses: The north cross depicts David, the Binding of Isaac and the miracles of Jesus.The south cross depicts the Arrest of Jesus, Daniel, and Adam and Eve.