Columbia subject headings:
Nikon, Patriarch of Moscow and of Russia, 1605-1681.
Old Believers--Russia--History--17th century.
Russia--Church history--17th century.
Russia--History--17th century.
Harvard subject headings:
Princeton subject headings:
Ivan IV, Czar of Russia, 1530-1584--Cult.
Russia--History--Time of Troubles, 1598-1613.