HMS Belfast is a Town-class light cruiser that was built for the Royal Navy. She is now permanently moored as a museum ship on the River Thames in London and is operated by the Imperial War Museum. Construction of Belfast, the first ship in the Royal Navy to be named after the capital city of Northern Ireland and one of ten Town-class cruisers, began in December 1936. She was launched on St Patrick's Day 1938. Commissioned in early August 1939 shortly before the outbreak of the Second World War, Belfast was initially part of the British naval blockade against Germany.