Sir John Trevor III (1626 – 28 May 1672) was a Welsh politician who sat in the House of Commons at various times between 1646 and 1672.
[1] His father was a member of parliament under James I and Charles I, and sat also in the parliaments of Oliver and of Richard Cromwell, and was a member of the council of state during the Commonwealth.
[3] After filling several public positions under the Commonwealth and Protectorate he was a member of the council of state appointed in February 1660 and under Charles II, he rose to a high position.
Having purchased the office of secretary of state he was knighted and entered upon its duties towards the end of 1668, just after he had helped to arrange an important treaty between England and France.
One of Trevor's great uncles was Sir Sackville Trevor (d. 1633), a naval officer, who was knighted in 1604; and another was Sir Thomas Trevor (1586–1656), one of the judges who decided in favour of the Crown in the famous case about the legality of ship money, and was afterwards impeached and fined.