Historical clue formulations

• 151, in old Rome — 2020-06-24
• Year in the reign of Antoninus Pius — 2016-06-18
• Roman 151 — 2015-12-22
• First noncanonical psalm in the Bible — 2015-02-07
• The year 151 — 2013-01-20
• 151, in old Rome — 2012-12-17
• 151, in old Rome — 2010-01-25
• Mid second-century year — 2009-12-10
• Middle of the second century — 2009-07-01
• Second-century year — 2009-02-28
• Second-century year — 2008-02-01
• 151, in old Rome — 2007-08-27
• Year in the papacy of St. Pius I — 2007-06-02
• Second-century year — 2007-03-24
• Height in feet of the Statue of Liberty, expressed in Roman numerals — 2007-02-10
• Mid second-century year — 2004-08-11
• Second-century year — 2003-10-04
• Middle of the second century — 2003-02-19
• 10% of MDX — 2002-09-06
• Year in Antoninus Pius's reign — 1999-02-07
• 151 on a monument — 1998-12-07
• Cato's 151 — 1997-03-04
• Second-century date — 1996-11-15
• Year in the reign of Pius I — 1996-07-20
• Second-century date — 1996-01-09
• Year in Ptolemy's life — 1995-03-12
• Second-century date — 1995-02-05
• XV x X + I — 1995-01-16
• Year in the reign of Pius I — 1994-07-28