Ar Imeallchríocha na Críostaíochta
Sa bhliain 591, chuaigh buíon manach as Beannchar ar eachtra go himeallchríocha na Críostaíochta ag craobhscaoileadh bhriathar Dé. Is é Columbanus Naomh ba cheann feadhna orthu. I measc na ndeisceabal a thug cúl le dúchas in éineacht leis, bhí cléireach darbh ainm Ceallach.

On the Peripheries of Christianity
In the year 591, a group of monks from Bangor went on an adventure to the outskirts of Christianity spreading the word of God. Saint Columbanus was their chief. Among the disciples who returned home with him, was a cleric named Cellach.