Historical clue formulations

• Birth year of King Philip I — 2012-11-17
• The year 1052 — 2007-02-19
• 1052, in a proclamation — 2004-08-16
• 14 years before the Battle of Hastings — 2004-04-01
• Mid 11th-century date — 2001-06-27
• Year of Philip I's birth — 2000-07-08
• Year in St. Leo IX's papacy — 1997-01-12