Sir Roger Mostyn was an English politician who sat in the House of Commons

House of Commons of England

The House of Commons of England was the lower house of the Parliament of England from its development in the 14th century to the union of England and Scotland in 1707, when it was replaced by the House of Commons of Great Britain...

  from 1621 to 1622.

Mostyn was the eldest surviving son of Sir Thomas Mostyn of Mostyn. His father was MP for Flintshire in 1577. He matriculated at Brasenose College, Oxford

Brasenose College, Oxford

Brasenose College, originally Brazen Nose College , is one of the constituent colleges of the University of Oxford in the United Kingdom. As of 2006, it has an estimated financial endowment of £98m...

 on 8 May 1584 aged 16, and was admitted at Lincoln's Inn

Lincoln's Inn

The Honourable Society of Lincoln's Inn is one of four Inns of Court in London to which barristers of England and Wales belong and where they are called to the Bar. The other three are Middle Temple, Inner Temple and Gray's Inn. Although Lincoln's Inn is able to trace its official records beyond...

 in 1588. In 1602 purchased a 13 year lease of Mostyn Colliery

Mostyn Colliery

Mostyn Colliery was a pioneering coal mine in Flintshire, North Wales, which was owned in the later part of its operating life by the influential Mostyn family. The mine was located on the banks of the River Dee.-Early history:...

 for £70 and immediately began a programme of expansion. He was knighted on 23 May 1606. By 1616 he had three pits on the colliery site and by 1619 the colliery was worth in the region of £700 annually to the Mostyn family, which suggests a fairly substantial output.

In 1621, Mostyn was elected 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,...

 for Flintshire

Flintshire (UK Parliament constituency)

Flintshire was a parliamentary constituency in North-East Wales which returned one Member of Parliament to the House of Commons of the Parliament of the United Kingdom from 1542 until it was abolished for the 1950 general election.- Boundaries :...

.

Mostyn died at the age of 75 and was buried at Whiteford.

Mostyn was the grandfather of Sir Roger Mostyn, 1st Baronet.