Byrne was the eldest of six children born to a family in Dublin, Ireland. His father was a cooper and his mother a hospital worker. He was raised Catholic and educated by the Irish Christian Brothers. He spent five years of his childhood in a seminary training to be a Catholic priest. He later said, "I spent five years in the seminary and I suppose it was assumed that you had a vocation. I have realized subsequently that I didn't have one at all. I don't believe in God. But I did believe at the time in this notion that you were being
