Terryglass situated beside Lough Derg provides an extensive and modern harbouring facility. Terryglass was the site of a monastery founded by St. Colman in the 6th century. It became a center of learning and produced, about 1150, the Book of Leinster now in Trinity College Dublin, an important collection of history, tales and poems in Middle Irish including the Brown Bull of Cooley. The Vikings frequently raided the abbey, and in 1264 the abbey was burnt. A remaining wall from this abbey can be seen at the back of Paddy’s pub in the village.