During the English Civil War he supported the Royalist cause and served Charles II of England in battle and in exile.
[1] He was an accomplished linguist, whose knowledge of "modern languages" like Spanish and Italian is said to have been a great advantage to him in his diplomatic career.
He was knighted at Breda in April 1660, and made Latin Secretary and Master of Requests for King Charles when in Holland.
[1] In 1666 Fanshawe was making preparations to return to England when he died suddenly at Siete Chimeneas, his house in Madrid at the age of 58.
He was initially buried at Allhallows, Hertford, and a few years later removed to St Mary's Church, Ware, where there is a monument (a marble aedicule).