Columba

Columba or Colmcille (7 December 521 – 9 June 597 AD) was an Irish abbot and missionary credited with spreading Christianity at the start of the Hiberno-Scottish mission in what became Scotland. 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 and one of the patron saints of Ireland along with Patrick and Brigid.