Historical clue formulations

• "12 Years a ___" — 2021-01-05
• Many a worker in ancient Rome — 2018-07-22
• Work like a dog — 2018-05-01
• Work like a dog — 2017-04-03
• One emancipated by emancipation — 2016-07-25
• Caliban in "The Tempest," e.g. — 2015-08-30
• Toil (away) — 2015-04-07
• Work like a dog — 2014-03-12
• Work like a dog — 2012-06-13
• ___ driver — 2012-04-08
• Toil — 2011-02-27
• Sweat blood — 2010-08-20
• Work like a dog — 2010-06-21
• Toil (away) — 2008-08-06
• Ben-Hur, for a time — 2007-10-21
• Work like a dog — 2007-08-16
• Slog — 2007-07-13
• Freedman, once — 2007-01-28
• Toil — 2006-09-28
• Underground Railroad user — 2005-10-18
• Kind of wages — 2004-11-13
• Androcles, e.g. — 2003-08-05
• Aida was one — 2001-12-18
• Work like a dog — 2000-10-23
• Amistad passenger — 2000-09-27
• Work like a dog — 1998-09-07
• Slog — 1998-08-30
• Verdi's Aïda, e.g. — 1998-05-31
• Drudge — 1998-03-13
• Ben-Hur, for one — 1998-02-14
• Spartacus, e.g. — 1998-02-02
• Toil (away) — 1997-09-11
• Drudge — 1997-08-03
• Drudge — 1997-02-26
• Kind of driver — 1995-08-06
• Nat Turner was one — 1995-03-22
• Spartacus, e.g. — 1995-02-13
• Work, work, work — 1994-01-17