The three Invincible-class battlecruisers were built for the Royal Navy and entered service in 1908 as the world's first battlecruisers. They were the brainchild of Admiral Sir John ("Jacky") Fisher, the man who had sponsored the construction of the world's first "all big gun" warship, HMS Dreadnought. He visualised a new breed of warship, somewhere between the armoured cruiser and battleship; it would have the armament of the latter, but the high speed of the former.