He was born the son of Arthur and Dorcas née Twiss Blennerhassett and educated at Trinity College, Dublin.
In the 1832 elections for Tralee he fought a duel with the Liberal candidate Maurice O'Connell (MP).
He died whilst staying in Nantes, France aged only 44.
He had married Frances Grady in 1821; they lived at Ballyseedy and had 9 children.
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