Historical clue formulations

• Pacific island Magellan visited in 1521 — 2017-09-01
• Philippine island — 2005-08-02
• Island visited by Magellan, 1521 — 2002-05-05
• Philippine island or its seaport — 1997-07-04
• Philippine island — 1997-02-02
• Oldest Spanish city in the Philippines — 1996-04-04
• Philippine isle — 1995-06-08
• Philippine island — 1994-08-03