Source : Webster's Revised Unabridged Dictionary (1913)

Marshalsea \Mar"shal*sea\, 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.