Thomas Southwell, 4th Viscount Southwell
Thomas Arthur Joseph Southwell, 4th Viscount Southwell KP (6 April 1836 – 26 April 1878) was an Irish peer. He became Viscount Southwell in 1860 on the death of Thomas Southwell, 3rd Viscount Southwell and was appointed a Knight of the Order of St Patrick on 2 August 1871.
- Rayment, Leigh. "Knights of the Order of St Patrick". Retrieved 2008-12-13.
The Earl of Granard
|Lord Lieutenant of Leitrim
The Lord Harlech
|Peerage of Ireland|