Webster’s Revised Unabridged Dictionary · 1913
Marshalsea
Mar′shal·sea (·sē), 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.]
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.