John Thomas Foster of Dunleer, was an Irish

Ireland

Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

 politician.

He was the son of Rev Thomas Foster, Rector of Dunleer and Dorothy née Burgh. Foster was elected member to the Irish House of Commons

Irish House of Commons

The Irish House of Commons was the lower house of the Parliament of Ireland, that existed from 1297 until 1800. The upper house was the House of Lords...

 for Dunleer

Dunleer (Parliament of Ireland constituency)

Dunleer was a constituency represented in the Irish House of Commons to 1801.-History:In the Patriot Parliament of 1689 summoned by King James II, Dunleer was not represented.-1692–1801:...

 in 1776 and held this seat until 1783. Subsequently he represented Ennis

Ennis (Parliament of Ireland constituency)

Ennis was a constituency represented in the Irish House of Commons until 1800.-History:In the Patriot Parliament of 1689 summoned by King James II, Ennis was represented with two members.-Members of Parliament, 1613–1801:**1613 John Thornton, Doonass....

 until 1790.

Foster married 1776, Lady Elizabeth Hervey

Elizabeth Cavendish, Duchess of Devonshire

Elizabeth Cavendish, Duchess of Devonshire , , is best known as an early woman novelist, and as the close friend of Georgiana Cavendish, Duchess of Devonshire...

 daughter of 4th Earl of Bristol; they separated 1781. Children:

• Frederick Thomas Foster (3 October 1777–1853) MP for Bury St Edmunds.
• Elizabeth Foster (17 November 1778 – 25 November 1778).
• Augustus John Foster
  Sir Augustus Foster, 1st Baronet
  Sir Augustus John Foster, 1st Baronet, GCH, PC was a British diplomat and politician. Born into a notable British family, Foster served in a variety of diplomatic functions in continental Europe and the United States, interrupted by a short stint as a Member of Parliament...
  
  , later Sir Augustus Foster, 1st Baronet (December 1780–1848).