Irish missionaries in the United Kingdom

Columba () or Colmcille (7 December 521 – 9 June 597 AD) was an Irish abbot and missionary evangelist credited with spreading Christianity in what is today Scotland at the start of the Hiberno-Scottish mission. 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. He was highly regarded by both the Gaels of Dál Riata and the Picts, and is remembered today as a Catholic saint and one of the Twelve Apostles of Ireland.

Plechelm, (Plechelm of Guelderland, Plechelm, also Pleghelm or Plechelmus; died 730), is honoured in both the Catholic Church and the Old Catholic Church as a patron saint of the Netherlands.

Saint Foillan (Faélán, Faolán, Foélán, ) is an Irish saint of the seventh century.

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