Background
Dennis was the son of John Dennis, a timber merchant of Kinsale, Company Cork, and Anne Bullen, daughter of William Bullen (d1735), of Southwater and Bullen"s Cove. Burgess of Kinsale.
Dennis was the son of John Dennis, a timber merchant of Kinsale, Company Cork, and Anne Bullen, daughter of William Bullen (d1735), of Southwater and Bullen"s Cove. Burgess of Kinsale.
Dennis became a barrister and was the legal advisor to Henry Boyle, 1st Earl of Shannon. He was sworn of the Irish Privy Council in 1777 and raised to the Peerage of Ireland as Baron Tracton, of Tracton Abbey in the County of Cork, on 4 January 1781.
He later sat as a member of the Irish House of Commons for Rathcormack between 1761 and 1768 and for Youghal between 1768 and 1777 and also served as Lord Chief Baron of the Exchequer in Ireland. He was a founding member of The Monks of the Screw.