According to Adomnan of Iona, who referenced the testimony of earlier abbots of Iona who had known Columba, St Columba visited the monastery at Clonmacnoise during the time when he was founding the monastery at Durrow. While he was there he prophesied about the future debates in the churches of Ireland about the dating of Easter and claimed that angels had visited the monastery at Clonmacnoise. While he was there, there was a young monk named Ernéne mac Craséni (who would later be famous in Ireland) who tried to touch Columba's clothes while Columba was not looking, but the saint immediately noticed and grabbed the boy by the neck, and then told him to open his mouth and he blessed him, saying that he would teach the doctrine of salvation.