Basileus

Greek title roughly meaning 'monarch'

Basileus is a Greek term and title that has signified various types of monarchs throughout history. In the English-speaking world it is perhaps most widely understood to mean 'monarch', referring to either a 'king' or an 'emperor'. The title was used by sovereigns and other persons of authority in ancient Greece, the Byzantine emperors, and the kings of modern Greece. The name Basileios (Basil), deriving from the term basileus, is a common given name in the Eastern Orthodox Church and Eastern Catholic Churches.

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