He was the third son of Sir Robert Deane, 5th Baronet and his wife Charleton Tilson, second daughter of Thomas Tilson. Deane was a Justice of the Peace and represented Baltimore in the Irish House of Commons from 1771 to until his death in 1780. In the latter year he had stood also for Helston in the British House of Commons, however the election was disputed caused by a double return. Before his case was to be heard, Deane died near Lyons, having been on the way to Nice to recover his health in the Mediterranean climate. In 1781, he was declared elected.
- "Leigh Rayment - Irish House of Commons 1692-1800". Retrieved 28 March 2009.
- "ThePeerage - Jocelyn Deane". Retrieved 27 March 2009.
- "Leigh Rayment - British House of Commons, Helston". Retrieved 28 March 2009.
- Lodge, John (1789). Mervyn Archdall, ed. The Peerage of Ireland or A Genealogical History of the Present Nobility of that Kingdom. vol. VII. Dublin: James Moore. p. 191.
- Oldfield, Thomas Hinton Burley (1816). The Representative History of Great Britain and Ireland. vol. II. London: Baldwin, Cradock and Joy. p. 156.
|Parliament of Ireland|
Sir John Evans-Freke, 1st Bt
|Member of Parliament for Baltimore
With: Sir John Evans-Freke, 1st Bt 1771–1777
William Evans 1777–1780
|Parliament of Great Britain|
Francis Cockayne Cust
|Member of Parliament for Helston
With: Philip Yorke