The Cyrus-class sixth rates of the Royal Navy were a series of sixteen-flush decked sloops of war built to an 1812 design by Sir William Rule, the Surveyor of the Navy. The first nine ships of the class were launched in 1813 and the remaining seven in 1814. The vessels of the class served at the end of the Napoleonic War. They were built on the lines of HMS Hermes, which was based in turn on the French ship Bonne Citoyenne.