HMS Ramillies was one of five Revenge-class battleships built for the Royal Navy during the First World War. They were developments of the Queen Elizabeth-class battleships, with reductions in size and speed to offset increases in the armour protection whilst retaining the same main battery of eight 15-inch (381 mm) guns. Completed in late 1917, Ramillies saw no combat during the war as both the British and the German fleets had adopted a more cautious strategy by this time owing to the increasing threat of naval mines and submarines.