The Knight Marshal is a former office in the British Royal Household established by Henry III in 1236.
The position later became a Deputy to the Earl Marshal from the reign of Henry VIII until the office was abolished in 1846.
They arrest in the Verge of the Court {i.e. within a 12 mile radius of the Sovereign's palace} when a Warrant is back'd by the Board of Green-cloth.
"The Knight Marshal was appointed by the Crown for life by letters patent under the great seal frequently in the form of grants in reversion.
The Marshalmen wore a distinctive uniform, consisting of a scarlet coat, blue trousers and a shako (a tall, cylindrical cap with a visor), and carried a baton engraved with the Royal Arms at one end, and at the other the coat of arms of the City of Westminster.