Dermot was a King of Leinster in Ireland. Ousted as King of Leinster in 1166, he sought military assistance from King Henry II of England to retake his kingdom. In return, MacMurrough pledged an Oath of Allegiance to Henry, who sent troops in support. As a further thanks for his reinstatement, MacMurrough's daughter Aoife was married to Richard de Clare, the 2nd Earl of Pembroke and a Cambro-Norman lord, known as "Strongbow."
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Dermot Morgan's birth name is Dermot John Morgan.
Dermot Murnaghan's birth name is Dermot John Murnaghan.
Dermot Palmer's birth name is Dermot Edward Henry Palmer.
Dermot Walsh's birth name is James P. Dermot Walsh.
Dermot Martin is 6'.
Dermot Heaney was born in 1971.
Dermot Honan died in 1986.
Dermot O'Mahony died in 1960.
Dermot O'Mahony was born in 1881.
Dermot Healy was born in 1947.
Dermot McNicholl was born in 1965.