Historical clue formulations

• Peaceful period — 2026-06-28
• Roman peace — 2021-11-29
• "___ et Lux" (motto for Tufts University) — 2020-11-04
• Goddess of peace — 2019-08-10
• Bellum's opposite — 2019-01-21
• ___ Americana — 2018-02-03
• Opposite of bellum — 2018-01-30
• ___ Romana — 2016-03-08
• "___ vobiscum" (Mass salutation) — 2016-02-21
• Time of wide-ranging stability — 2015-12-04
• Bellum's opposite — 2013-11-28
• Bellum's opposite — 2013-09-23
• ___ Americana — 2012-11-18
• Peace, to Pliny — 2012-09-26
• ___ Romana — 2011-11-15
• Irene's counterpart in Roman myth — 2009-02-11
• Irene's Roman counterpart — 2008-04-25
• ___ Britannica — 2007-09-01
• Latin Mass subject — 2006-06-29
• Opposite of bellum — 2001-11-05
• Period of stability — 2000-12-20
• Bellum's opposite — 1999-03-30
• Bellum antithesis — 1998-05-21
• Opposite of bellum — 1998-01-30
• Mars's opposite — 1997-04-27