Marshal
Noun: The Marshal is the referee of the Belegarth battlefield. On a national level, Marshals wear a yellow or gold tabard that clearly denotes them as a Marshal. Their duties are to ensure the enforcement of the Book of War, the rules of the Belegarth combat field, and to look out for the safety of the combatants.
Addtional Note: Although the Book of War uses this term, these individuals are more commonly referred to as Heralds because that's what they used to be called prior to the split. The two terms are almost completely synonymous in Belegarth culture today.