Historical clue formulations

• Chairs, e.g. — 2023-03-16
• Chairs, for instance — 2023-02-18
• Presidents and prime ministers — 2019-04-15
• Heads — 2011-05-06
• Captains and commanders — 2010-11-08
• Supremos — 2006-12-31
• Biggest stories — 2003-07-11
• Summit attendees — 2002-07-14
• Heads — 2000-06-11
• Fishing wires — 1999-05-09
• They're followed — 1996-12-28