Background
He was the only son of John Parnell, Esq., Member of Parliament, Judge of the Court of King"s Bench, and Mary, sister of the Lord Chief-Justice Whitshed.
He was the only son of John Parnell, Esq., Member of Parliament, Judge of the Court of King"s Bench, and Mary, sister of the Lord Chief-Justice Whitshed.
He was appointed High Sheriff of Queen"s County in 1753. Sir John married Anne, second daughter of the Honorary Michael Ward, of Castle Ward, County Down, one of the judges of the court of King"s Bench in Ireland.
He was a Member of Parliament (Member of Parliament) for Maryborough in 1761, and was created a Baronet of Rathleague, Queen's County, on 3 November 1766.