Related Clues:

• Male monarch (Var.)
• Boris Godunov, for one (Var.)
• Simeon I, for one (Var.)
• Peter or Paul, e.g. (Var.)
• Ruler of yore (Var.)
• Word derived from 10-Down
• More nervous
• Ruler opposed by the Bolsheviks
• Peter or Nicholas
• Russian monarch, once (Var.)
• Royal Russian (Var.)
• Romanov title (Var.)
• Less ordinary
• Peter or Ivan, e.g. (Var.)
• Former Winter Palace resident