Historical clue formulations

• House of ___-Coburg and Gotha — 2023-09-03
• ___-Altenburg (old German duchy) — 2016-02-25
• Old German duchy name — 2015-05-02
• ___-Coburg (former German duchy) — 2014-07-30
• ___-Coburg and Gotha (former British ruling family) — 2013-09-12
• Old German duchy name — 2013-07-07
• Old German duchy name — 2012-12-20
• ___-Altenburg (former German duchy) — 2011-05-26
• Name in old German duchies — 2011-02-04
• ___-Coburg- Gotha, former British royal house — 2010-05-17
• ___-Coburg-Gotha (old British royal house) — 2009-12-30
• ___-Weimar-Eisenach (duchy until W.W. I) — 2009-05-08
• Old German duchy name — 2008-07-09
• Partner of Coburg, historically — 2007-08-17
• ___-Coburg (part of historic Germany) — 2006-11-27
• 18th-century French marshal — 2006-07-01
• Old German duchy name — 2006-03-10
• ___-Altenburg (old German duchy) — 2005-12-23
• Old German duchy name — 2005-12-18
• Old German duchy — 2005-05-18
• ___-Coburg, old German duchy — 2004-12-31
• ___-Coburg-Gotha — 2000-02-03
• Old duchy in royal family names — 1997-11-22
• Old German duchy name — 1997-03-13
• ___-Coburg-Gotha (British royal house) — 1997-02-17
• House of ___-Coburg-Gotha — 1996-08-13
• _____-Coburg (former duchy) — 1993-12-10