6th-century Christian abbots

founder of Christian monasticism, founder of the Benedictine order (480–547)

Columba () or Colmcille (7 December 521 – 9 June 597 AD) was an Irish abbot and missionary evangelist credited with spreading Christianity in what is today Scotland at the start of the Hiberno-Scottish mission. He founded the important abbey on Iona, which became a dominant religious and political institution in the region for centuries. He is the patron saint of Derry. He was highly regarded by both the Gaels of Dál Riata and the Picts, and is remembered today as a Catholic saint and one of the Twelve Apostles of Ireland.

Byzantine saint

Visigoth bishop and chronicler

abbot of Bangor-on-Dee in Wales (6th-7th centuries)