Historical clue formulations

• Capital of Eritrea — 2023-06-23
• Capital of Eritrea — 2021-09-29
• Eritrea's capital — 2015-11-22
• Capital of Eritrea — 2011-08-21
• Eritrea's capital — 2009-06-03
• Capital east of Khartoum — 2005-05-21
• Eritrea's capital — 2003-08-15
• Capital of Eritrea — 2001-12-14
• Eritrea's capital — 1999-06-13
• Eritrea's capital — 1998-11-08
• Eritrean capital — 1998-06-21