Background
Thynne was the eldest son of Sir Thomas Thynne, of Longleat, Wiltshire.
Thynne was the eldest son of Sir Thomas Thynne, of Longleat, Wiltshire.
He was knighted at Berwick on 23 June 1639. He was disabled from sitting in 1642. In 1655 Thynne founded an almshouse at Longbridge Deverill.
Following the Restoration, he was High Sheriff of Wiltshire in 1661.
Sir Christopher Wren advised him on improvements to the house at Longleat which included the great stairs and stone terrace. In 1664 he was re-elected Member of Parliament for Wiltshire in the Cavalier Parliament and sat until his death in 1670.
Cavalier Parliament]
In November 1640, Thynne was elected Member of Parliament for Wiltshire in the Long Parliament.