Career
Rowley was the son of Hercules Rowley and Elizabeth Upton, 1st Viscountess Langford. He was returned to the Irish House of Commons for both County Antrim and Downpatrick in 1783, but chose to sit for Antrim, a seat he held until 1791 when he succeeded his mother in the viscountcy and entered the Irish House of Lords. Lord Langford died unmarried in March 1796, aged 58.
The viscountcy died with him.
