Historical clue formulations

• Champion, as a cause — 2026-07-23
• Life partner — 2023-12-17
• Other half — 2021-11-05
• Other half — 2019-10-08
• Frequent co-signatory — 2017-07-20
• Half of some partnerships — 2014-11-27
• Other half — 2011-02-24
• Clytemnestra, to Agamemnon — 2009-10-18
• Marital partner — 2004-11-29
• Partner — 2002-09-04
• Helpmate — 1999-12-30
• Better half — 1998-10-14