That person established the Supreme Privy Council in order to undermine the Senate and the Holy Synod.
One person with this first name employed the private secretary Willem Mons, who was executed for embezzlement. That person established the Supreme Privy Council in order to undermine the Senate and the Holy Synod. One person with this name passed the Edict of Romorantin as a follow-up to the Edict of Amboise, which ended the first phase of the French (*) Wars of Religion. That person with this name convinced Charles IX to execute Gaspard II de Coligny. A ruler with this name obtained the throne by a coup planned in cooperation with Grigory Orlov, and a person of this name from the house of Medici was the wife of Henry II of France. For 10 points, give the common name of these women, one of whom was an Empress of Russia called 'the Great.'
One person with this first name employed the private secretary Willem Mons, who was executed for embezzlement.
Catherine [or Yekaterina or Caterina or other obvious equivalents]