Definition of Earl Marshal of England
A great officer of state who had anciently several courts under his jurisdiction, as the court of chivalry and the court of honor. Under him is the herald’s office, or college of arms. He was also a judge of the Marshalsea court, now abolished. This office is of great antiquity, and has been for several ages hereditary in the family of the Howards. 3 Bl.Comm. 68, 103.
That's the definition of Earl Marshal of England in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.