Peter Julius Coyet (1618–1667), was a prominent Swedish envoy to England during the time of Oliver Cromwell.
He was born in Stockholm as the son of Gillis Coyet and the brother of Otto and Frederick Coyett; the family was of Flemish origin.
[2] Like his brother - the first Swede to travel to Japan and China - Coyet was knighted in 1649, and in December 1654–May 1656 he was sent as an envoy in England.
[1] In July 1655 Crister Bonde arrived as ambassador to England and both dealt with Bulstrode Whitelocke on using Swedish ports, but their negotiations during the Second Northern War about the English trade in the Baltic and with Russia seems to have been unsuccessful, although he was knighted by Oliver Cromwell the Lord Protector in 1656.
[3] In 1657 he was appointed State Secretary of Sweden and reassigned to Holland to deal with Coenraad van Beuningen and Johan de Witt.