Another naval historian. Origin of some of the early carriers.
The British carriers Furious, Courageous, and Glorious were all conversions of light battlecruisers of the same names, although the ships were also classified as “large light cruisers” as they had cruiser speed and armor, but carried four 15 inch guns in the Courageous and Glorious, and one 18 inch gun in the Furious which was originally completed as a hybrid carrier/cruiser.
The British carrier Eagle was a conversion of the partially-built battleship of the same name. The Eagle had been originally ordered by Chile before the war, and was taken over by the British, with monetary compensation, at the start of the war. Construction was drastically slowed by the need for antisubmarine vessels, and the surplus of battleships. The Eagle’s sister ship, the Canada, served with the Grand Fleet at Jutland, and was returned to Chile following the war.
The US carriers Lexington and Saratoga were both conversions of battlecruisers that otherwise would have been scrapped under the terms of the 1922 Washington Naval Treaty.
The French carrier Bearn was a conversion of a partially completed “Normandie” class battleship whose construction had been suspended during World War One.
The Japanese carrier Akagi was a conversion of a battlecruiser that would also have been scrapped under the Washington Naval Treaty, and its sister ship Amagi was also being converted, but was severely damaged by the 1923 Tokyo earthquake and then scrapped. The carrier Kaga was converted from the uncompleted battleship of the same name as replacement for the Amagi. The decision to convert the Shinano was made following the Battle of Midway to make up for Japanese carrier losses.
The Shinano also has the distinction of being the largest warship ever sunk by a submarine, the Archerfish, in November of 1944. The US Naval Technical Mission to Japan did a detailed study of the loss of the ship at the behest of the US Navy Bureau of Ships.
I hope that this bit of naval history trivia is interesting to you.