The Great Officers of the Crown were appointed by the King of France and there were seven all told. Their was no prime minister but there was a Chief Minister at times. A similar list called the Great Dignitaries of the Empire was made by Napoleon with these positions being ,usually, an honorific.
The Constable of France (1060 - 1626) was the First Officer of the Crown and commanded the Army and was responsible for the Chivalry.
Marshal of France and later Marshal of the Empire, (1190 - 1967), alternated between being junior to and then senior to the Constable of France.
Marachal de Nord-Marshal of the North
Marachal de Sud-Marshal of the South
Lieutenantgeneral A regional commander of the army who served at the King's discretion.