Martyn, a cousin to the Admiralty Court judge Sir Henry Marten*, entered the service of Henry Herbert, 2nd earl of Pembroke, soon after leaving Oxford.
Martyn was one of the few Wootton Bassett Members in the early Stuart period who was a local man. During the 1604-10 sessions, with Alexander Tutt, his fellow borough Member, he was named to committees for considering the bill to remove benefit of the clergy from cattle and sheep stealers (21 Apr. 1604), for assuring various lands and tenements to the dean and chapter of Windsor (21 Apr. 1604), and for Thomas Mompesson’s estate bill (added 11 Dec. 1606).
Little is known of Martyn after his service in Parliament. He died intestate in July 1626, possessing his Swindon estate together with other lands in Upham and Aldbourne.
