For 10 points, identify this Russian tsar of the 16th century, whose byname comes from his formidable qualities.
Vasily Poznyakov led an expedition under the auspices of this ruler to Egypt, after the archdeacon Gennady perished. This man declared himself the Hand of God at one point, which led him to amass three hundred personal body guards in his residence. A pervading fear of a Tatar incursion led this person to lead conquests of Kazan and Astrakhan. He brutally tortured Archbishop Pimen as part of the incident known as the Novgorod Massacre, which was instigated by oprichniks. He also had St. Basil Cathedral constructed, allegedly blinding the architect.  For 10 points, identify this Russian tsar of the 16th century, whose byname comes from his formidable qualities.
Vasily Poznyakov led an expedition under the auspices of this ruler to Egypt, after the archdeacon Gennady perished.
{Ivan IV} Vasilyevich or {Ivan} the {Terrible} or {Ivan Groznyi}