The word soldier derives from the Middle English word soudeour, from Anglo-French soudeer or soudeour, meaning mercenary, from soudee, meaning shilling's worth or wage, from sou or soud, shilling.[1] The word is also related to the Medieval Latin soldarius, meaning soldier (literally, "one having pay").[2] These words ultimately derive the Late Latin word solidus, referring to an Ancient Roman coin used in the Byzantine Empire.[1][2]