Historical clue formulations

• "Terrible" czar — 2025-02-19
• "The Terrible" czar — 2024-02-11
• "The Terrible" czar — 2017-06-18
• Czar known for his mental instability — 2016-02-27
• First monarch to be crowned Tsar of All Russia — 2009-09-05
• "Terrible" czar — 2007-01-19