The Mural Crown is an award given to the first Roman legionnaire to get over the wall during War Games at Camp Jupiter. It is a bronze badge shaped like a laurel wreath.
The Heroes of Olympus
The Son of Neptune
Before the War Games, Gwen told the Fifth Cohort that she would make sure the first one of them over the wall would get the Mural Crown. Frank Zhang receives the Mural Crown with the help of Percy Jackson and Hazel Levesque.