Mural crown
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The term Mural crown (from Latin corona muralis) as used in Roman antiquity, was a golden crown, or a circle of gold intended to resemble a battlement, bestowed to a soldier who first climbed the wall of a besieged city or fortress to successfully place a standard of the attacking army.
The term is also used in heraldry to denote a crown modeled after the walls of a castle. In recent times, mural crowns have been used in opposition to royal crowns; it's typical of Italian medieval and modern Communes and is a symbol of Italy; also the coat of arms of the Second Spanish Republic had a mural crown.