William, Prince of Wales, is the heir apparent to the British throne. He is the elder son of King Charles III and Diana, Princess of Wales.
Shaking hands with Barbara Bush, 1991. His mother, Diana, and brother, Harry, look on.
In Royal Air Force uniform at the 2010 Trooping the Colour
Piloting a Sea King helicopter in 2010
With Catherine on the Buckingham Palace balcony on their wedding day
An heir apparent or simply heir is a person who is first in an order of succession and cannot be displaced from inheriting by the birth of another person. A person who is first in the current order of succession but could be displaced by the birth of a more eligible heir is known as heir presumptive.
Throngs before the Imperial Palace in Japan awaiting the appearance of the Crown Prince Hirohito for the recent proclamation of his official recognition as the heir apparent to the Japanese Imperial Throne – New York Times, 1916.