HMS Yarmouth was a 64-gun third rate ship of the line

Ship of the line

A ship of the line was a type of naval warship constructed from the 17th through the mid-19th century to take part in the naval tactic known as the line of battle, in which two columns of opposing warships would manoeuvre to bring the greatest weight of broadside guns to bear...

 of the Royal Navy

Royal Navy

The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

, built at Deptford Dockyard. She was previously ordered to the dimensions specified in the 1741 proposals for modifications to the 1719 Establishment

1719 Establishment

The 1719 Establishment was the first formal 'Establishment' laid down to govern the construction of all ships built or rebuilt down to those of 20 carriage guns, whether in the Royal Dockyards or by commercial contractors...

, but the Admiralty had very quickly concluded that these were too small, and as an experiment in 1742 authorised an addition of 6ft to the planned length, and the Yarmouth was re-ordered to the enlarged design in June 1742. She was built at Deptford, where the Admiralty felt they could best observe the effectiveness of the added size, and launched on 8 March 1745.

Commissioned in February 1745 under Captain Roger Martin. In 1747 under Captain Piercy Brett she was one of George Anson

George Anson, 1st Baron Anson

Admiral of the Fleet George Anson, 1st Baron Anson PC, FRS, RN was a British admiral and a wealthy aristocrat, noted for his circumnavigation of the globe and his role overseeing the Royal Navy during the Seven Years' War...

's squadron at the First Battle of Cape Finisterre. In 1781, Yarmouth was reduced in armament to become a 60-gun ship. She remained in this role until 1811, when she was broken up.