HMS Britannia was a King Edward VII-class pre-dreadnought battleship of the Royal Navy. She was named after Britannia, the Latin name of Great Britain under Roman rule. The ship was built by Portsmouth Dockyard between 1904 and 1906. Armed with a battery of four 12-inch (305 mm) and four 9.2 in (234 mm) guns, she and her sister ships marked a significant advance in offensive power compared to earlier British battleship designs that did not carry the 9.2 in guns.