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Sire is a form of address for reigning kings in the United Kingdom and in Belgium. It has also been used in France, Italy, Germany, Portugal, Sweden and Spain. 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 word "sire" and the French "(mon)sieur" share a common etymologic origin, both ultimately being related to the Latin senior.