knight marshal

Wiktionary

1. n. UK, historical An officer in the royal household, responsible for maintaining order in court.

GNU Webster's 1913

1. n. (Eng. Law) An officer in the household of the British sovereign, who has cognizance of transgressions within the royal household and verge, and of contracts made there, a member of the household being one of the parties.
2. n. formerly, in England, the marshal of the king's house, who was authorized to hear and determine all pleas of the Crown, to punish faults committed within the verge, etc. His court was called the Court of Marshalsea.