Trivia

Before becoming an actor, he was an archaelogist, a schoolteacher, a short-order cook, and a plumber.

He has Irish citizenship and resident alien status in the United States.

Speaks English and Gaeilge (Irish Gaelic).

Started acting at the age of 29 and he went to America for the first time when he was 37.

In a November 1999 interview with the New York Post, he claimed to have been molested by his Latin teacher while at an English seminary preparing for priesthood.

Learned to speak Gaelic in college and still speaks it fluently.

Autobiography titled "Pictures in My Head"

Has a son, Jack Daniel, born 1989; and a daughter, Romy Marion, born 1992.

Older brother of Donal, Thomas, Breda, Margaret and Marian (deceased).

In Camelot (2008) Gabriel Byrne plays King Arthur. In Excalibur (1981) he plays Arthur's father, Uther Pendragon.

Cites Federico Fellini's Amarcord (1973) as one of his all-time favorite movies.

Son of Dan Byrne and Eileen Gannon.

He was a football played with the Stella Maris Football Club in Drumcondra, Dublin.

Was nominated for Broadway's 2000 Tony Award as Best Actor (Play) for a revival of Eugene O'Neill's "A Moon for the Misbegotten."

He has acted in films with all three actors who played Superman's arch enemy Lex Luthor in live-action films: Gene Hackman in Enemy of the State (1998), Kevin Spacey in The Usual Suspects (1995) and Jesse Eisenberg in Louder Than Bombs (2015).

He's a patron of The West of Ireland Cardiology Foundation, Croi, since 1997.

Born on exactly the same date as Bruce Boxleitner.