He spent the next 15 years of his life working with fellow monks converting the inhabitants of the Roe Valley and founding the churches at Faughanvale and Enagh. In about 565 AD he left Ireland and joined Columba on Iona where he continued his work and established monasteries and churches on the islands of Coll, Tiree, Mull, South Uist and Kintyre as well as on the Scottish mainland. It is highly likely that he returned to Ireland with Columba to attend the Convention of Drumceatt in 575AD. Shortly after this, he is credited with founding a monastery at Aghanloo not far from his first monastic settlement of Drumachose. In 577 AD he founded the Abbey of Aghaboe where he spent the remainder of his life and where he died in 598, aged 84 years.