Historical clue formulations

• Center of a court — 2021-02-21
• High chair? — 2019-01-20
• Homophone of 16-Across — 2012-06-13
• It's definitely a reserved seat — 2009-10-17
• Seat of power — 2006-02-26
• Symbol of sovereignty — 2005-10-09
• It's fit for a queen — 2003-06-10
• Seat of power — 2001-02-13
• Royal seat — 1998-08-17
• Seat of power — 1994-08-16