Sir Thomas Southwell, 1st Baronet

Sir Thomas Southwell married Elizabeth Starkey, daughter of William Starkey. She would survive him and die in September 1688.^[7]

Thomas and Elizabeth had one son:

1. Richard Southwell, who married Elizabeth daughter of Murrough O'Brien, 1st Earl of Inchiquin^[8]

—and three daughters:

1. Garthruid, married John Piggot of Kilfinny as his first wife^[9]
2. Margaret, married ___ Piggott^[10]
3. Joan, married Sir William Oughtred Courtenay of Powderham in Devonshire, Baronet^[11]

Southwell served as High Sheriff of Kerry, High Sheriff of Clare, and High Sheriff of County Limerick in 1654 under the Protectorate. On 4 August 1662 he was created 1st Baronet Southwell, of Castle Mattress in the Baronetage of Ireland, by Charles II.^[12] The castle mentioned in the territorial designation stands on the left bank of the River Deel, west of Rathkeale, and is also called Matrix or Matras.

Sir Thomas Southwell died in December 1680^[13] or in May 1681^[14] and was buried in Rathkeale. His eldest son, the member of parliament Richard Southwell, predeceased him^[8] and he was succeeded by his grandson Thomas, later 1st Baron, as the 2nd Baronet Southwell.

• Burke, Bernard; Burke, Ashworth Peter (1915). A Genealogical and Heraldic History of the Peerage and Baronetage, the Privy Council, Knightage and Companionage (77th ed.). London: Harrison. OCLC 1155471554.
• Cokayne, George Edward (1903). Complete Baronetage, 1611 to 1800. Vol. III (1st ed.). Exeter: William Pollard & Co. OCLC 866278985. – 1649 to 1664
• Debrett, John (1828). Peerage of the United Kingdom of Great Britain and Ireland. Vol. II (17th ed.). London: F. C. and J. Rivington. OCLC 54499602. – Scotland and Ireland
• Kilburn, Matthew (2004). "Southwell, Thomas, first Baron Southwell". In Matthew, Colin; Harrison, Brian (eds.). Oxford Dictionary of National Biography. Vol. 51. New York: Oxford University Press. pp. 721–722. ISBN 0-19-861401-2.
• Lodge, John (1789). Archdall, Mervyn (ed.). The Peerage of Ireland or, A Genealogical History of the Present Nobility of that Kingdom. Vol. VI. Dublin: James Moore. OCLC 264906028. – Viscounts, barons
• MacCarthy-Morrogh, Michael (1983). The Munster Plantation 1583–1641 (PDF) (Ph.D.). Royal Holloway, University of London.