Sire
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Sire is a respectful form of address for reigning kings in Europe. It has been used in Belgium, France, Italy, Germany, Sweden, Spain and the United Kingdom. Historically Sire had a wider usage. During the Middle Ages, Sire was generally used to address a superior, a person of importance or in a position of authority or the nobility in general.
The words "sire" and "sir", as well as the French "(mon)sieur", share a common etymological origin, all ultimately being related to the Latin senior.