The Bellerophon class was a class of three dreadnought battleships that were built in the United Kingdom prior to World War I, and served in the Royal Navy during the war. The Bellerophons were near carbon copies of the previous HMS Dreadnought, with the exception of a second tripod mast. The lead ship, HMS Bellerophon, was laid down on the same day of Dreadnought's final completion, which was also built at Portsmouth Dockyard.