 He sat for Bere Alston, Devon, in the Convention Parliament, was one of the first Serjeants called at the Restoration (22 June 1660), and soon afterwards (9 November) was advanced to the rank of king's serjeant and knighted (16 November).With his brother-serjeant, Sir John Glynne, he rode in the coronation procession, on 23 April 1661, behind the attorney and solicitor-general, much to the disgust of Samuel Pepys, who regarded him as a turncoat.As king's serjeant, Maynard appeared for the crown at some of the state trials with which the new reign was inaugurated, among others that of Sir Henry Vane in Trinity term 1662.