The Treaty of Tordesillas, signed in Tordesillas, Spain on 7 June 1494, and authenticated in Setúbal, Portugal, divided the newly discovered lands outside Europe between the Portuguese Empire and the Spanish Empire (Crown of Castile), along a meridian 370 leagues west of the Cape Verde islands, off the west coast of Africa. That line of demarcation was about halfway between the Cape Verde islands (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 division proposed by Pope Alexander VI. The treaty was signed by Spain, , and by Portugal, . The other side of the world was divided a few decades later by the Treaty of Zaragoza, signed on , which specified the antimeridian to the line of demarcation specified in the Treaty of Tordesillas. Originals of both treaties are kept at the General Archive of the Indies in Spain and at the Torre do Tombo National Archive in Portugal. Despite considerable lack of information regarding the geography of the New World, Portugal and Spain largely respected the treaty. The other European powers, however, did not sign the treaty and generally ignored it, particularly those that became Protestant after the Reformation. Similarly, the indigenous peoples of the Americas did not acknowledge the treaty, and as the legal foundation for the discovery doctrine, it has been a source of ongoing tension regarding land ownership into modern times. The treaty was included by UNESCO in 2007 in its Memory of the World Programme. Signing and enforcement The Treaty of Tordesillas was intended to solve the dispute that arose following the return of Christopher Columbus and his crew, who had sailed under the Crown of Castile. On his way back to Spain he first stopped at Lisbon, where he requested another meeting with King John II to prove to him that there were more islands to the southwest of the Canary Islands. After learning of the Castilian-sponsored voyage, the Portuguese King sent a threatening letter to the Catholic Monarchs, King Ferdinand and Queen Isabella, stating that by the Treaty of Alcáçovas signed in 1479 and by the 1481 papal bull Aeterni regis that granted all lands south of the Canary Islands to Portugal,