John Fiennes was an English Member of Parliament

Member of Parliament

A Member of Parliament is a representative of the voters to a :parliament. In many countries with bicameral parliaments, the term applies specifically to members of the lower house, as upper houses often have a different title, such as senate, and thus also have different titles for its members,...

 during the Civil War

English Civil War

The English Civil War was a series of armed conflicts and political machinations between Parliamentarians and Royalists...

 and Commonwealth period.

Fiennes was the third son of the 1st Viscount Saye and Sele

William Fiennes, 1st Viscount Saye and Sele

William Fiennes, 1st Viscount Saye and Sele was born at the family home of Broughton Castle near Banbury, in Oxfordshire. He was the only son of Richard Fiennes, seventh Baron Saye and Sele...

. At the outbreak of the English Civil War

English Civil War

The English Civil War was a series of armed conflicts and political machinations between Parliamentarians and Royalists...

 he joined the Parliamentary side, was colonel of a regiment of horse by 1643, and served at the Battle of Naseby

Battle of Naseby

The Battle of Naseby was the key battle of the first English Civil War. On 14 June 1645, the main army of King Charles I was destroyed by the Parliamentarian New Model Army commanded by Sir Thomas Fairfax and Oliver Cromwell.-The Campaign:...

.

He was elected to the Long Parliament

Long Parliament

The Long Parliament was made on 3 November 1640, following the Bishops' Wars. It received its name from the fact that through an Act of Parliament, it could only be dissolved with the agreement of the members, and those members did not agree to its dissolution until after the English Civil War and...

 as member for Morpeth

Morpeth (UK Parliament constituency)

Morpeth was a borough constituency centred on the town of Morpeth in Northumberland represented in the House of Commons of the Parliament of England until 1707, the Parliament of Great Britain from 1707 to 1800, and then the Parliament of the United Kingdom....

, probably in 1645, but was one of the MPs excluded in Pride's Purge

Pride's Purge

Pride’s Purge is an event in December 1648, during the Second English Civil War, when troops under the command of Colonel Thomas Pride forcibly removed from the Long Parliament all those who were not supporters of the Grandees in the New Model Army and the Independents...

 in December 1648. In 1658, he was chosen a member of Cromwell's Upper House.