What is "mural crown"

Mural \Mu"ral\, a. [F., fr. L. muralis, fr. murus wall. See Mure a wall.]

1. Of or pertaining to a wall; being on, or in, a wall; growing on, or against, a wall; as, a mural quadrant. ``Mural breach.''
   --Milton. ``Mural fruit.''
   --Evelyn.

2. Resembling a wall; perpendicular or steep; as, a mural precipice.

   Mural circle (Astron.), a graduated circle, in the plane of the meridian, attached permanently to a perpendicular wall; -- used for measuring arcs of the meridian. See Circle, n.,

3. Mural crown (Rom. Antiq.), a golden crown, or circle of gold indented so as to resemble a battlement, bestowed on him who first mounted the wall of a besieged place, and there lodged a standard.

n. A crown or headpiece representing city walls or towers, used as a military decoration in Ancient Rome and later as a heraldic symbol in Europe.

A mural crown is a crown or headpiece representing city walls or towers. In classical antiquity, it was an emblem of tutelary deities who watched over a city, and among the Romans a military decoration. Later the mural crown developed into a symbol of European heraldry, mostly for cities and towns, and in the 19th and 20th centuries was used in some republican heraldry.