Treaty of Zaragoza in the context of "Kings of Portugal"

The Treaty of Tordesillas, signed in Tordesillas, Spain, on 7 June 1494, and ratified in Setúbal, Portugal, divided the newly discovered lands outside Europe between the Kingdom of Portugal and the Crown of Castile, along a meridian 370 leagues or 2,100 kilometres (1,300 mi) west of the Cape Verde islands, off the west coast of Africa. That line of demarcation was about halfway between Cape Verde (already Portuguese) and the islands visited by Christopher Columbus on his first voyage (claimed for Castile and León), named in the treaty as Cipangu and Antillia (Cuba and Hispaniola).

The lands to the east would belong to Portugal and the lands to the west to Castile, modifying an earlier bull by Pope Alexander VI. The treaty was created on 7 June 1494, then ratified by Spain on 2 July 1494, by Portugal on 5 September 1494, and by Pope Julius II on 24 January 1506. The other side of the world was divided a few decades later by the Treaty of Zaragoza, signed on 22 April 1529, which specified the antimeridian to the line of demarcation specified in the Treaty of Tordesillas. Portugal and Spain largely respected the treaties, while the Indigenous peoples of the Americas did not acknowledge them.

Ruy López de Villalobos (Spanish pronunciation: [ruj ˈlopeθ ðe βiʝaˈloβos]; c. 1500 – 23 April 1546) was a Spanish explorer who led a failed attempt to colonize the Philippines in 1544, attempting to assert Spanish control there under the terms of the treaties of Tordesillas and Zaragoza. Unable to feed his men through barter, raiding, or farming and unable to request resupply from New Spain due to poor knowledge of the Pacific's winds and currents, Villalobos abandoned his mission and fled to the Portuguese-held Moluccas, where he died in prison. He is chiefly remembered for some sources crediting him with naming Leyte and Samar "Las Islas Filipinas" in 1543 in honor of the Spanish crown prince Philip (later King Philip II). The name was later extended across the entire Philippine Archipelago and its nation. (Other sources credit the name to one of his captains, Bernardo de la Torre.)