HMS Captain was a 70-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 according to the 1733 proposals of 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...

 at Woolwich Dockyard

Woolwich Dockyard

Woolwich Dockyard was an English naval dockyard founded by King Henry VIII in 1512 to build his flagship Henri Grâce à Dieu , the largest ship of its day....

, and launched on 14 April 1743.

In 1760, Captain was reduced to a 64-gun ship, and in 1777 she was converted to serve as a storeship. Captain remained in this role until she was broken up in 1783.