Born: March 19, 1822, Newry, County Down, Ireland.
Died: November 10, 1890, near Dublin, Ireland.
Pseudonym: Sliabh Cuilinn.
John was the husband of Frances, daughter of the first Lord O’Hagan (married 1861)
He was educated at the day school of the Jesuit Fathers, Dublin, and at Trinity College, graduating in 1842.
In 1842 he was called to the bar and joined the Munster Circuit. In 1861 he was appointed a Commissioner of National Education, and in 1865 he became Q. C.
After Gladstone had passed his Irish Land Act, he chose O’Hagan as the first judicial head of the Irish Land Commission, making him for this purpose a judge of Her Majesty’s High Court of Justice.
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