High Quality Content by WIKIPEDIA articles! HMS Neptune was a 90-gun second rate ship of the line of the Royal Navy. She was built under the 1677 "Thirty Great Ships" Programme and launched in 1683 at Deptford Dockyard. She was first commissioned in 1690 under Captain Thomas Gardiner, as the flagship of Vice-Admiral George Rooke. In that capacity she took part in the Battle of Barfleur in May 1692.