The Knight Marshal is a former office in the British Royal Household established by Henry III in 1236.
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 separate office of Knight Marischal exists in the Royal Household of Scotland, but has not been filled since 1863.
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.