He organized the first meeting of an assembly known as the (*) zemsky sobor.
The religious text known as the Stoglav is structured as a set of responses to 100 questions posed by this man. The Astrakhan Khanate was annexed during this man's rule by his general Alexander Gorbaty-Shuisky. He organized the first meeting of an assembly known as the (*) zemsky sobor. Stephen Bathory expelled the forces of this ruler from Livonia during that region's namesake war. The Massacre of Novgorod was carried out by this man's secret police, the oprichniki. This ruler was succeeded by his mentally handicapped son Feodor I after accidentally killing his other son. For 10 points, name this first Rurikid Russian tsar nicknamed for his cruelty.
The religious text known as the Stoglav is structured as a set of responses to 100 questions posed by this man.
Ivan the Terrible (or Ivan IV Vasilyevich; or Ivan Grozny; prompt on just “Ivan”)