Following the Glorious Revolution in 1688, Bellingham fled Ireland to live with cousins in Preston, Lancashire.
He returned to Ireland in May 1690 as a colonel in the army of William III of England.
[1][2] Following the conclusion of the Williamite War in Ireland, Bellingham was elected as a Member of Parliament for County Louth in the Irish House of Commons, sitting between 1692 and 1713.
[1] He rebuilt the family home of Bellingham Castle in the Dutch style in the 1690s.
He kept a campaign diary for the period 28 August 1689 to 12 September 1690, which was edited and published by Anthony Hewitson as the Diary of Thomas Bellingham, an officer under William III (1908).