HMS Indomitable

There have been two warships named Indomitable, but the most powerful ship of the lineage was its last. One of the Invincible-class was to be named Indomitable, but the name was later changed to Ark Royal.
HMS Indomitable (1907) was the first battlecruiser in the world beating her sister-ship Inflexible by four months. She was launched in 1907 and scrapped in 1922.
HMS Indomitable (R92) was an Illustrious-class armoured fleet aircraft carrier launched in 1940. She varied from the earlier ships in her class by having double hangar decks, originally intended to increase aircraft capacity. Ultimately, as aircraft size increased, this proved to be a limiting factor. She was scrapped in 1955.
*For the names of four vessels in the Star Wars universe named Indomitable, see Star Wars Indomitable