HMS Royal Charles (1660) in the context of "Peter Pett (shipwright, died 1672)"

Naseby was a three-decker ship of the line built for the Commonwealth of England's Navy. She was one of four Second rates authorised by the Council of State on 3 July 1654 as part of the 1654 Construction Programme, intended to carry 60 guns each. Construction was allocated to Woolwich Dockyard, where the ship was to be designed and built by Peter Pett II. She was named Naseby, in honour of Sir Thomas Fairfax's decisive 1645 victory over the Royalist forces during the English Civil Wars.

However, it was decided early on to alter the Programme to include a First rate "suitable as a fleet flagship", and Naseby was altered during construction to mount a complete battery of guns along the upper deck (compared with the partial battery on this deck of her intended sisters, on which there were no gunports in the waist along this deck), and so was reclassed as a First rate of 80 guns. Her length was extended by 7 ft (compared with her intended sisters), allowing room for a 14th pair of gunports on the lower deck, and also 14 pairs on the middle deck, as well as 13 pairs on the now fully-armed upper deck and 6 pairs on the quarterdeck.