Historical clue formulations

• Several Russian czars — 2021-11-26
• Several Russian czars — 2018-02-11
• Two Romanov czars — 2014-11-17
• Several Russian czars — 2012-08-08
• Several czars — 2006-03-12
• Several Russian czars — 2006-01-30
• Several czars — 2003-12-25
• Several czars — 2001-09-16
• Several Russian czars — 2001-07-02
• Six Russian czars and grand dukes — 2000-07-21
• Three czars — 1998-11-13
• Pavlov and Lendl — 1998-04-14
• Russian Johns — 1994-01-21