The Kings were the leaders of many European countries until the events of World War I. Kings, and their conquests, were the primary foci of the Middle Ages.
Kings are exclusive only in certain game modes of Age of Empires II and are available in the Scenario Editor. Kings are also available and seen in campaigns where they often represent historical characters. The Mongols encounter a King (the Khwarezmian Shah) in their campaigns; the Spanish meet two (Kings Sancho and Alfonso).
In the skirmish and multiplayer modes, Kings appear only appear in the Regicide game mode. Although they are weak and possess no attack, players that lose their King automatically loses the game. However, Kings move very quickly, and are useful for scouting in the early game. Later, they are best kept behind walls or garrisoned inside Castles.
Kings like heroes, cannot be converted.