John Thomas Townshend, 2nd Viscount Sydney of St Leonards (21 February 1764 – 20 January 1831) was a British

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 peer

Peerage

The Peerage is a legal system of largely hereditary titles in the United Kingdom, which constitute the ranks of British nobility and is part of the British honours system...

.

He was the son of Thomas Townshend, 1st Viscount Sydney

Thomas Townshend, 1st Viscount Sydney

Thomas Townshend, 1st Viscount Sydney PC , was a British politician who held several important Cabinet posts in the second half of the 18th century...

 of St Leonards and Elizabeth Powys. On 13 April 1790 he married Hon. Sophia Southwell, daughter of Edward Southwell, 20th Baron de Clifford

Edward Southwell, 20th Baron de Clifford

Edward Southwell, 20th Baron de Clifford was a British politician.He was the son of Edward Southwell by his wife Katherine, daughter of Edward Watson, Viscount Sondes....

. They had one child;

• Hon. Sophia Mary Townshend (died 6 Dec 1852).

He married a second time, to Caroline Elizabeth Letitia Clements, daughter of Robert Clements, 1st Earl of Leitrim

Robert Clements, 1st Earl of Leitrim

Robert Clements, 1st Earl of Leitrim was an Irish nobleman and politician.Son of Cavan Borough MP Nathaniel Clements, Deputy Vice Treasurer and Teller of the Irish Exchequer, Clements served as High Sheriff of Leitrim in 1759, having been the previous year appointed as Controller of the Great and...

, on 27 May 1802. They had two children:

• Mary Elizabeth Sydney (died 25 December 1847)
• John Robert Townshend, 1st Earl Sydney (1805–1890)