mural crown
Concise Oxford English Dictionary © 2008 Oxford University Press:
mural crown
▶noun
- 1 Heraldry a representation of a city wall in the form of a crown, borne above the shield in the arms of distinguished soldiers and of some civic authorities.
- 2 (in ancient Roman times) a crown or garland given to the soldier who was first to scale the wall of a besieged town.
'mural crown' also found in these Oxford entries:

