Related Clues:

• Serbian Empire rulers
• Old line in Russia
• Caesar's therefore turned south to find those monsters
• Ivan the Terrible et al
• Pre-Soviet succession
• Goes off without the right when ugly customers appear
• Gorse destroyed by monsters
• Peters out after 1762, for example
• Fairytale creatures feared among progressives
• Bedtime story baddies
• Old rulers
• Scary ones
• High chiefs of sports
• Old Russian line
• Brutish baddies