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In page History of Portugal (1415–1578):

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  • 1490 — Columbus leaves for Spain after his father-in-law's death.
  • 1492 — First exploration of the Indian Ocean.[citation needed]
  • 1494 — The Treaty of Tordesillas between Portugal and Spain divided the world into two parts, Spain claiming all non-Christian lands west of a north–south line 370 leagues west of the Azores, Portugal claiming all non-Christian lands east of that line.