Shinano was laid down in May 1940 as the third Yamato-class battleship. After the loss of four fleet carriers at Midway, the IJN ordered the hull converted to an aircraft carrier. She was launched on 8 October 1944 and formally commissioned at Yokosuka on 19 November 1944.
Her fitting out was not finished. The Navy General Staff ordered her to leave for Kure by 28 November to complete it there and to carry 50 Ohka rocket-propelled flying bombs. She was sunk on the way on 29 November 1944 by four torpedoes from the American submarine Archerfish, ten days after commissioning. Over a thousand sailors and civilians were rescued and 1,435 were lost, including her captain. She remains the largest ship ever sunk by a submarine.
Sources: Wikipedia (ship articles), the Kure Maritime History Science Museum photograph records on Wikimedia Commons, and combinedfleet.com for the Chitose-class histories. No commanding-officer records were available for these ships.