Alternate names/spellings: Columbanus
Dates: 543 - 615 (Dates are approximate. )
St. Columban (not to be confused with his contemporary and compatriot, "St. Columba":http://medievalsourcesbibliography.org/authors/252), was an Irish bishop and missionary. He was Irish, but he spent most of his life traveling in Frankish kingdoms and founding monasteries, most notably Luxeuil and Bobbio. He wrote a monastic rule that preserves the characteristics of Celtic monasticism. Among his other writings are sermons, poems, letters, and a penitential manual.