A king, ruler, or sovereign, especially in ancient Greece; also, a title for the Byzantine emperor.
From Greek 'basileus' (king), possibly from Proto-Indo-European roots meaning 'master of the house.' The word evolved from ancient Athens through Sparta and was later adopted by the Byzantine Empire.
Basileus started as an ancient Greek word for king, but it became so prestigious that the Byzantine emperors adopted it—they called themselves 'basileus' for centuries because the word carried the weight of Greek and Roman authority.
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