Earl Marshal of the College of Arms, the body concerned with all matters of genealogy and heraldry. In conjunction with the Lord High Constable, he had held a court, known as the Court of Chivalry, for the administration of justice in accordance with the law of arms, which was concerned with many subjects relating to military matters, such as ransom, booty and soldiers' wages, and including the misuse of armorial bearings. In 1672, the office of Marshal of England and the title of Earl Marshal of England were made hereditary in the Howard family. In a declaration made on 16 June 1673
Miles Fitzalan-Howard, 17th Duke of Norfolk following year and retired the same day, after 31 years of service. The Duke inherited the Barony of Beaumont from his mother, the 11th Baroness, in 1971, and the Barony Howard of Glossop from his father, the 3rd Baron, in 1972. When he was Lord Beaumont he inherited the Dukedom of Norfolk from his second cousin once removed, The 16th Duke of Norfolk, in 1975 and added his mother's maiden name of Stapleton before his own that year. He also inherited the Great Office of Earl Marshal and Hereditary Marshal of England, which is attached to the Dukedom of Norfolk,