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
Earl of Mar by John Erskine, the 23rd/6th Earl of Mar, who was an important Jacobite military leader during the 1715 Jacobite rising. Margaret of Mar, 31st Countess of Mar holds the first creation, and James Erskine, 14th Earl of Mar and 16th Earl of Kellie holds the seventh. The Earl of Mar and Kellie is the hereditary Clan Chief of Clan Erskine; the Countess of Mar is the hereditary Clan Chief of Clan Mar. The Earldom of Mar is thought to be the oldest peerage in Great Britain, and even Europe. The family seat of Earl of Mar (first creation) is St