Background
He was the oldest son of Thomas Southwell, 1st Baron Southwell and his wife Lady Meliora Coningsby, eldest daughter of Thomas Coningsby, 1st Earl Coningsby.
He was the oldest son of Thomas Southwell, 1st Baron Southwell and his wife Lady Meliora Coningsby, eldest daughter of Thomas Coningsby, 1st Earl Coningsby.
In 1743, Southwell became Grandmaster of the Grand Lodge of Ireland, a position he held until the following year. In 1717, Southwell entered the Irish House of Commons for Limerick County, the same constituency his father had represented before, and sat for it until 1720, when he succeeded him also as baron. In 1726, Southwell was sworn of the Privy Council of Ireland.
He became a Fellow of the Royal Society in 1735 and was Governor of County Limerick until his resignation in 1762.
Southwell died at Craig"s Court, Charing Cross, aged 68 and was succeeded in his titles by his eldest surviving son Thomas.
Royal Society.