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Coats of arms of mercy, also coats of arms of favor or symbols of mercy, were awarded by emperors , kings or other sovereigns as a symbol of special favor. The crest of meritorious, mostly noble individuals or families was in prior surveys as a mark of favor, for example, the imperial eagle or the sovereign tribe crest added.
Example:
Medici : In the top pill three golden lilies on a blue field - a variation of the French royal coat of arms - is a sign of mercy from King Louis XI. of France (r. 1461–1483.)