Definify.com
Webster 1913 Edition
Marshalsea
Mar′shal-sea
,Noun.
 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.
Webster 1828 Edition
Marshalsea
M`ARSHALSEA
,Noun.
  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.