Historical clue formulations

• Yemen's capital — 2021-06-22
• Yemen's capital — 2020-07-22
• Capital across the Red Sea from Asmara — 2018-10-27
• Mideast capital supposedly founded by a son of Noah — 2016-11-15
• Yemeni capital — 2015-10-20
• Capital near Aden — 2015-01-30
• Yemen's capital — 2014-06-24
• Mideast capital — 2013-12-22
• Yemen's capital — 2013-09-30
• Where Yemen Airways is based — 2013-05-12
• Mideast capital — 2012-12-02
• Capital near 10-Down — 2011-04-29
• Capital largely surrounded by high clay walls — 2010-02-19
• Yemen's capital — 2010-02-16
• Mideast capital — 2009-06-11
• Capital on the Arabian Peninsula — 2008-08-06
• Yemen's capital — 2008-08-04
• Walled city of the Mideast — 2007-10-26
• Mideast capital — 2007-08-05
• Yemen's capital — 2007-06-24
• Arabian capital — 2007-04-22
• Mideast capital — 2007-04-18
• Mideast capital — 2006-09-03
• Yemen Gate locale — 2006-07-22
• Mideast capital — 2005-02-05
• Arabian peninsula city — 2003-08-31
• Arabian capital — 2003-07-27
• Mideast capital — 2003-05-08
• Arabian Peninsula city — 2002-03-24
• Capital of Yemen — 2001-05-20
• Mideast capital — 1999-12-11
• Yemen's capital — 1999-04-11
• Yemen's capital — 1999-03-16
• Mideast capital — 1998-10-29
• Mideast capital — 1997-10-18
• Yemen's capital — 1997-07-16
• Yemen's capital — 1997-04-15
• Mideast capital — 1996-11-17
• Yemen's capital — 1996-08-13
• Yemen's capital — 1996-04-22
• Yemen's capital — 1995-10-10
• Capital of Yemen — 1995-09-05
• Yemen's capital — 1994-11-10
• Capital of Yemen — 1994-10-06
• Mens_____ in corpore sano — 1994-07-13
• Mideast capital — 1994-06-24