John Boys (Royalist) Boys himself went to London rather than continue further military resistance while others of the Regiment went on to serve at Wallingford Castle. During August 1648, he made a futile attempt to raise the Siege of Walmer Castle in Deal, one of the Cinque Ports, and customary home of the Lord Warden. Sir Algernon Sydney replaced him as Warden in 1648. In 1659, Boys was held as a prisoner in Dover Castle for "petitioning for a free Parliament", but was released on 23 February 1660. He was then, reputedly, granted the office of Receiver of Customs at Dover from Charles
Lord Warden of the Cinque Ports powers of muster", and the Constableship of Dover Castle, later added (1267) to the Warden's office, enabled him to keep a garrison and administrative staff, including the Clerk and the Lieutenant of the Castle. The coat of arms of the Cinque Ports first appeared in 1305, second amongst the earliest English known heraldic emblems, predating even the coat of arms of the City of London. The coat of arms of the Cinque Ports displays three ships' hulls and three lions conjoined to these hulls, all in gold. These may originally have been "Gules three lions passant gardant in pale "