The colorful ceremony dates back to the beginning of the 13th century in which the new Lord Mayor travels to the Royal Courts to pledge allegiance to the crown.
The king insisted that each newly-elected mayor should come to Westminster and swear loyalty to the crown, and the mayor has been making that journey for over 800 years.
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Over the centuries, the colorful and joyous procession became known as the Lord Mayor's Show.
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Nowadays the Lord Mayor is the head of the City of London Corporation, and the role is separate from the mayor of London.