Clement I was the third pope after St Peter and author of a famous letter to the Corinthians to strengthen and encourage peace and unity among them, an early example of the bishop of Rome’s universal jurisdiction. Tradition records him being sentenced to hard labour in the Crimea and thrown into the sea, tied to an anchor (his emblem in art) in 97. – CTS New Daily Roman Missal 2012, p 3171; Christian Prayer 1990, p 1282
Columban was born in 540 in Leinster Ireland. He was well trained in the classics and theology. After entering the monastic life at an early age, he travelled with a dozen companions to France and founded many monasteries which he ruled with strict discipline. After being forced into exile, he went to Italy and founded the monastery of Bobbio. He died in 615 at Bobbio. – CTS New Daily Roman Missal 2012, p 3171; Christian Prayer 1990, p 1282