For 10 points, name this 17th century tsar, a son of Michael Romanov.
This ruler invited Makarios of Antioch to a synod that condemned the Stoglav and the teachings of Avvakum, who opposed making the cross with three fingers. By the Treaty of Pereyaslav, this ruler agreed to protect the Zaporozhian host of Bohdan Khmelnytsky. During this ruler's reign, the raskol (*) split occurred when Patriarch Nikon's reforms upset the Old Believers. This tsar's forces devastated Poland during the Deluge and put down the uprising of Stenka Razin. For 10 points, name this 17th century tsar, a son of Michael Romanov.
This ruler invited Makarios of Antioch to a synod that condemned the Stoglav and the teachings of Avvakum, who opposed making the cross with three fingers.
Tsar Alexis of Russia [or Alexis I; or Alexei Mikhailovich]