...Columba (Columcille or Colm) was born at Gartan, County Donegal, 7thDecember 521, and was the son of a chief related to several of theprinces then reigning in Ireland and the west of Scotland... 
Dugald Butler and Herbert Story 「Scottish Cathedrals and Abbeys」
...It is certain that about the middle of the sixthcentury an Irish prince of distinguished ancestry,and himself a saint, led a band of missionariesfrom Donegal to Iona...
John W. Bradley 「Illuminated Manuscripts」
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