The court of the "marshal at which cases involving the king's servants were heard; as were cases which fell within the "verge. From this, there was the prison known as the Marshalsea, where such a court was to be found in Southwark, under the control of the marshal. During the king's travels around the country, or across the channel, the marshalsea would oversee many of the arrangements necessary for moving such a great organisation. -
Dictionary of Medieval Terms and Phrases. Christopher Coredon with Ann Williams.