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In page Mayor:

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In modern England and Wales, the position of mayor descends from the feudal lord's bailiff or reeve (see borough). The chief magistrate of London bore the title of portreeve for considerably more than a century after the Norman Conquest. This official was elected by popular choice, a privilege secured from King John. By the beginning of the 12th century, the title of portreeve gave way to that of mayor as the designation of the chief officer of London, followed around 1190 by that of Winchester. Other boroughs adopted the title later.[citation needed]