Columba

Saint Columba (7 December 521 – 9 June 597 AD)—also known as Colum Cille, or Chille (Old Irish, meaning "dove of the church"), Colm Cille (Irish), Calum Cille (Scottish Gaelic), Colum Keeilley (Manx Gaelic) and Kolban or Kolbjørn (Old Norse)—was a Gaelic Irish missionary monk who propagated Christianity among the Picts during the Early Medieval Period. He was one of the Twelve Apostles of Ireland.

Earliest Life in Ireland
Columba was born to Fedlimid and Eithne of the Cenel Conaill in Gartan, near Lough Gartan, in modern County Donegal in the north of Ireland. On his father's side he was great-great-grandson of Niall of the Nine Hostages, an Irish high king of the 5th century. He was baptised in Temple-Douglas, in the County Donegal parish of Conwal (mid-way between Gartan and Letterkenny), by his teacher and foster-uncle Saint Crunathan.In early Christian Ireland the druidic tradition collapsed due to the spread of the new Christian faith. The study of Latin learning and Christian theology in monasteries flourished. Columba became a pupil at the monastic school at Clonard Abbey, situated on the River Boyne in modern County Meath. During the sixth century, some of the most significant names in the history of Irish Christianity studied at the Clonard monastery. It is said that the average number of scholars under instruction at Clonard was 3,000. Twelve students who studied under St. Finnian became known as the Twelve Apostles of Ireland; Columba was one of them. He became a monk and eventually ordained a priest. During this time he is said to have founded a number of monasteries, including ones at Kells, Derry, and Swords.

Tradition asserts that, sometime around 560, he became involved in a quarrel with Saint Finnian of Movilla Abbey over a psalter. Columba copied the manuscript at the scriptorium under Saint Finnian, intending to keep the copy. Saint Finnian disputed his right to keep the copy. The dispute eventually led to the pitched Battle of Cúl Dreimhne in 561, during which many men were killed. A synod of clerics and scholars threatened to excommunicate him for these deaths, but St. Brendan of Birr spoke on his behalf with the result that he was allowed to go into exile instead. Columba suggested that he would work as a missionary in Scotland to help convert as many people as had been killed in the battle. He exiled himself from Ireland, to return only once, many years later.

Columba's copy of the psalter has been traditionally associated with the Cathach of St. Columba.