\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.