This leader supported the canton of Grisons in its claim to the Valtelline Valley before signing the Treaty of Monzon. The Treaty of Regensburg went unsigned by this man. The Code Michaud issued by this man defined the role of intendants. One plot to overthrow him was organized by Cinq-Mars. Another attempt to remove this man from power was supported by the prince Gaston and resulted in the Day of the Dupes. That failed attempt led to this man's 
This leader supported the canton of Grisons in its claim to the Valtelline Valley before signing the Treaty of Monzon. The Treaty of Regensburg went unsigned by this man. The Code Michaud issued by this man defined the role of intendants. One plot to overthrow him was organized by Cinq-Mars. Another attempt to remove this man from power was supported by the prince Gaston and resulted in the Day of the Dupes. That failed attempt led to this man's supremacy over Marie de Medici in influencing Marie's son, the king. For 10 points, name this chief minister and cardinal who served under Louis XIII of France.
This leader supported the canton of Grisons in its claim to the Valtelline Valley before signing the Treaty of Monzon.
Cardinal de Richelieu [or Duc de Richelieu; or Armand-Jean du Plessis]