^In 1952, Princess Elizabeth acceded as the monarch of seven Commonwealth realms. At the time of her death, she reigned as Queen of 15 sovereign states including the United Kingdom. From 1957–1983, most of her British colonies attained independence, and some joined the other realms in different years; most states ceased to be a realm upon becoming republics.
^The Vatican was in a territorial dispute with the Kingdom of Italy from 1870–1929.
^ a bKim's year of birth has been the subject of dispute. North Korean authorities and state-run media have stated Kim's birth date is 8 January 1982, but South Korean intelligence officials believe the actual date is a year later. Until 2018, the U.S. Treasury Department had claimed that his year of birth is 1984.