The King George V class is the seventh dreadnought design to be completed by the Royal Navy, and the second class of super-dreadnoughts with heavier armament and armour. Fitted with improved 13.5" guns, a stronger power plant, rearranged armour, improved underwater protection and optimized secondary artillery firing arcs, they are a considerable advance from the preceding Orion class. The ships were commissioned in 1912 and 1913.