Historical clue formulations

• 551, once — 2013-10-22
• Mid sixth-century year — 2013-08-11
• Mid sixth-century year — 2011-06-30
• Mid sixth-century year — 2010-01-13
• Sixth-century year — 2009-10-10
• Sixth-century year — 2008-09-21
• Mid sixth-century year — 2007-09-05
• Mid sixth-century date — 2007-08-16
• Mid-sixth-century year — 2006-05-23
• Year in Justinian I's reign — 2005-07-30
• Sixth-century year — 2005-07-17
• 551, once — 2005-06-23
• A multiple of XIX — 2004-12-31
• 551, in 551 — 2004-03-21
• Sixth-century date — 2002-01-24
• Year in Vigilius's papacy — 2002-01-12
• Mid 6th-century date — 2001-08-29
• Year in Justinian I's reign — 2001-07-14
• Year in Vigilius's papacy — 2001-06-30
• 551, to Caesar — 2001-01-22
• Year in Vigilius's papacy — 2001-01-07
• Mid-6th-century date — 2000-08-13
• Sixth-century date — 1999-12-23
• Mid-6th-century date — 1999-07-15
• Year in Vigilius's papacy — 1998-09-13
• 551, in Latium — 1998-01-12
• Sixth-century date — 1994-12-25
• Half of MCII — 1994-11-21
• Sixth-century date — 1994-11-11
• Sixth-century date — 1994-01-26