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...

, launched 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....

 in 1678.

She underwent her first rebuild at Portsmouth Dockyard, where she was reconstructed as a 70-gun third rate built to the 1706 Establishment

1706 Establishment

The 1706 Establishment was the first formal establishment of dimensions for ships built for the Royal Navy. Two previous sets of dimensions had been established, though only for particular shipbuilding programmes; the 1706 Establishment was intended to be permanent.-Origins:Dimensions for ships had...

, and relaunched on 6 July 1708. Her second rebuild also took place at Portsmouth

Portsmouth

Portsmouth is the second largest city in the ceremonial county of Hampshire on the south coast of England. Portsmouth is notable for being the United Kingdom's only island city; it is located mainly on Portsea Island...

, from where she was relaunched on 21 May 1722 as a 70-gun third rate 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...

.

Captain was hulked in 1739, and eventually broken up in 1762.