This historic monastic site was established in the 7th centry by Saint Colman. The monastery contains a round tower, notable as both fine example of this particularly Irish feature but also because of its noticeable lean, over half a metre from the vertical. The tower is over 30 metres tall, with the only doorway some 7 metres above ground level. This site was of such importance that it became the centre of a new diocese, the Diocese of Kilmacduagh, in the 12th century