See under Champion of England.
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Definition for king's champion (2 of 2)
Champion of England
a hereditary official at British coronations, representing the king (King's Champion) or the queen (Queen's Champion) who is being crowned, and having originally the function of challenging to mortal combat any person disputing the right of the new sovereign to rule.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019