Apostle (not as the Twelve, but in the lesser meaning of "first evangelist") and patron Saint of Ireland.

Born in England , taken as a slave to Ireland where he became a fervent christian, he managed to escape to Gaul where he was ordained a bishop, and then returned to Ireland as a very successful missionary. He's said to have used a 3-leaves shamrock to explain the Holy Trinity (a concept he was quite obsessed with), thus making it the national symbol of Ireland.

Died c. 471.