Historical clue formulations

• Year that Michelangelo started "David" — 2017-05-25
• The year 1501 — 2015-04-21
• The year 1501 — 2014-06-23
• Century-starting year — 2014-02-07
• Year in a voyage by Amerigo Vespucci — 2012-01-05
• Year Michelangelo began work on "David" — 2011-10-16
• Start of the 16th century — 2011-08-26
• Century-starting year — 2010-12-23
• Year Michelangelo began work on "David" — 2010-09-30
• Year Michelangelo began "David" — 2008-11-13
• Year that Michelangelo began work on "David" — 2008-07-20
• Year of an Amerigo Vespucci voyage — 2007-07-12
• 16th-century start — 2004-02-29
• Year in an Amerigo Vespucci voyage — 2004-02-08
• Year Vespucci sailed to the New World — 2003-10-03
• Year in Ivan the Great's rule — 2002-04-13
• Start of the 16th century — 2000-09-12
• Year that Michelangelo began work on "David" — 1999-08-19
• Year that Michelangelo sculpted the "Pietà" — 1998-05-23
• 16th-century date — 1996-03-27
• Year in Henry VII's reign — 1995-05-27
• Year in Henry VII's reign — 1994-07-23