%marshalsea%

n. [ Marshal + OE. se a seat. See See a seat. ] The court or seat of a marshal; hence, the prison in Southwark, belonging to the marshal of the king's household. [ Eng. ] [ 1913 Webster ]

Court of Marshalsea, a court formerly held before the steward and marshal of the king's house to administer justice between the king's domestic servants. Blackstone. [ 1913 Webster ]