King is the title given to a male monarch in a variety of contexts. The female equivalent is queen regnant, while the title of queen on its own usually refers to the consort of a king.In the context of prehistory, antiquity and contemporary indigenous peoples, the title may refer to tribal kingship. Germanic kingship is cognate with Indo-European traditions of tribal rulership. In the context of classical antiquity, king may translate in Latin as rex and in Greek as archon or basileus. In classical European feudalism, the title of king as the ruler of a kingdom is understood to be the highest rank in the feudal order, potentially subject, at least nominally, only to an emperor. In a modern context, the title may refer to the ruler of one of a number of modern monarchies. The title of king is used alongside other titles for monarchs: in the West, emperor, grand prince, prince, archduke, duke or grand duke, and in the Islamic world, malik, sultan, emir or hakim, etc. The city-states of the Aztec Empire had a Tlatoani, which were kings of pre-Hispanic Mesoamerica. The Huey Tlatoani was the emperor of the Aztecs.