He was the first son of James Hamilton of Sheephill and Holmpatrick, Deputy Prothonotary of the Court of King's Bench, and his first wife Hannah Phillips and the grandson of James Hamilton, Member of Parliament for Newry from 1723 and Carlow from 1727.
He was subsequently elected to the British House of Commons for County Dublin, a seat he held until his death in December 1822.
[2] Through his son James, he was a grandfather of Ion Trant Hamilton (1839–1898), who also represented County Dublin in Parliament.
It was said that a peerage had been his grandfather's dearest wish, but his efforts to obtain one were unsuccessful; he also lobbied hard for the advancement of his relatives.
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