Background
He was the third son of Honorary Henry Hamilton and his wife Mary Dawson, daughter of Joshua Dawson.
He was the third son of Honorary Henry Hamilton and his wife Mary Dawson, daughter of Joshua Dawson.
Hamilton entered the Irish House of Commons for Street Johnstown (County Longford) in 1780 and sat for the constituency until 1783. Subsequently he was elected for Rathcormack and Clogher. In the following year he stood successfully for Armagh Borough, which he represented until 1798.
In 1796, he was sworn of the Privy Council of Ireland.
In 1780, Hamilton was appointed Under-Secretary to the Lord Lieutenant of Ireland. He held this post until February 1795 and again from May of the same year until 1796.
They had a son.
He chose the latter and was a Member of Parliament for the constituency until 1795, resigning the seat to be Escheator of Munster, a notional "office of profit under the crown".