High Quality Content by WIKIPEDIA articles! HMS Princess Royal was the second of two Lion-class battlecruisers built for the Royal Navy before World War I. Designed in response to the Moltke-class battlecruisers of the German Navy, the ships significantly improved on the speed, armament, and armour of the preceding Indefatigable class. The ship was named for The Princess Royal, a title occasionally granted to the Monarch`s eldest daughter.