Historical clue formulations

• 2011 Lady Gaga hit — 2026-01-04
• He sold out his master in exchange for silver — 2026-01-04
• Benedict Arnold sort — 2023-06-24
• Traitor — 2007-08-14
• Untrustworthy one — 2005-02-13
• Traitor — 2002-05-03
• Biblical betrayer — 2000-05-29
• Back stabber — 1998-11-29