A Marshal

1. (historical) A high-ranking officer in the household of a medieval prince or lord, who was originally in charge of the cavalry and later the military forces in general.
2. A military officer of the highest rank in several countries, including France and the former Soviet Union; equivalent to a general of the army in the United States. See also field marshal.
3. A person in charge of the ceremonial arrangement and management of a gathering.
4. (US) A federal lawman.