 Bellomont was Member of Parliament for Droitwich from 1688 to 1695. In the 1690s he became involved in the attempts by Jacob Leisler's son to clear his father's name. Leisler had been a leading force in the New York rebellion against the Dominion of New England established by King James. Upon the arrival of Henry Sloughter as governor of New York, Leisler was arrested, tried, and executed for treason, and his properties were seized. Leisler's son Jacob Jr. traveled to England to argue the case for restoration of the family properties. Bellomont sat on the Parliamentary committee that examined the evidence, and spoke in Parliament in support of the Leisler's case. He strongly stated his view that Leisler and son-in-law Jacob Milborne had been "barbarously murdered" by Sloughter's actions in a letter to Massachusetts colonial agent Increase Mather. Young Leisler's efforts were successful: Parliament voted to reverse the attainder, and ordered that the family properties be restored.
