HMS Lion was a Battlecruiser built for the Royal Navy in 1910. She was the lead ship of her class, which was nicknamed the ‘Splendid Cats’. They were significant improvements over their predecessors of the indefatigable class in terms of speed, armament and armour. This was in response to the first battlecruisers, the Moltke class, which were very much larger and more powerful than the first British Battlecruisers, the Invincible class.