"Saint Patrick (Latin: Sanctus Patricius, Irish: Naomh Pádraig) (c. 387 – 17 March, 493...) was a Romanized-Celt, a Romano-Briton and Christian missionary, who is the most generally recognised patron saint of Ireland...
"Two authentic letters from him survive, from which come the only universally accepted details of his life. When he was about 16 he was captured from Britain by Irish raiders and taken as a slave to Ireland, where he lived for six years before escaping and returning to his family. After entering the Church, he returned to Ireland as an ordained bishop in the north and west of the island, but little is known about the places where he worked."
Also from Wikipedia:
"Originally the colour associated with Saint Patrick was blue. However, over the years the colour green and its association with Saint Patrick's day grew. Green ribbons and shamrocks were worn in celebration of St Patrick's Day as early as the 17th century. He is said to have used the shamrock, a three-leaved plant, to explain the Holy Trinity to the pre-Christian Irish, and the wearing and display of shamrocks and shamrock-inspired designs have become a ubiquitous feature of the day. Then in the 1798 rebellion in hopes of making a political statement Irish soldiers wore full green uniforms on 17 March in hopes of catching attention with their unusual fashion gimmick. The phrase 'the wearing of the green', meaning to wear a shamrock on one's clothing, derives from the song of the same name."
I find it fascinating. Still, I will don a kilt, drink Guinness, and eat corned beef and cabbage. Maybe I'll wear green AND blue to cover my bases. :)