Historical clue formulations

• Worthy of notice — 2017-06-24
• Well-known, now — 2016-03-18
• In a position of prominence — 2010-10-16
• Well-known — 2001-11-09
• Hardly obscure — 2001-11-02
• Known, geographically speaking — 2001-05-07
• Publicly known — 1999-06-30