Who Was In Charge Of Drawing The Line Of Demarcation?

On May four, 1493, the Spanish-born Pope Alexander Half dozen decreed in the balderdash Inter caetera that all lands west and south of a pole-to-pole line one hundred leagues w and south of any of the islands of the Azores or the Cape Verde Islands should belong to Espana. Portugal objected because its status and rights had been omitted and overlooked. Rex John Two of Portugal began negotiations directly with Rex Ferdinand and Queen Isabella of Spain to push the line west and allow him to lay claim to lands discovered east of it. The issue was the Treaty of Tordesillas.
Signed in Tordesillas, Espana, on June vii, 1494, the treaty established a line of demarcation that was 370 leagues west of the Cape verde Islands (already Portuguese). Spain gained most of the Americas, except for the Brazilian bulge of South America, and Portugal, whose explorers had already reached the west coast of Africa, could claim lands discovered to the due east. However, considering the line was neither defined past degrees of longitude nor strictly enforced, unlike interpretations regarding its applied implementation resulted. In addition, the line did not encircle the earth.

Lines of demarcation, 1493, 1494, and 1529. [From Wikipedia]

After Ferdinand Magellan's expedition (1519–22), the expanse of the Pacific came into play, peculiarly the Spice Islands (Moluccas), which both countries claimed. Always needing money for his European wars, Charles V of Spain sought a applied solution to the "Moluccas effect" later he married Isabella of Portugal in 1526; he signed a new treaty with Portugal in Zaragoza, Spain, on April 22, 1529. The Treaty of Saragossa (or Zaragoza) provided an antimeridian to the line established by the Treaty of Tordesillas. Portugal paid Spain 350,000 ducats for the Moluccas, and, to prevent farther Castilian encroachment, the new line of demarcation was established almost three hundred leagues (or 17°) to the e of these islands. Portugal got command of all of the lands to the west of the line, including Asia, and Spain received virtually of the Pacific Bounding main. Spain's argument that the Treaty of Tordesillas divided the world into two equal hemispheres was not recognized in the Treaty of Saragossa: Portugal'due south share was approximately 191°, whereas Spain'south was roughly 169°, with a variation of almost ±4° owing to the dubiousness of the location of the Tordesillas line. Castilian interest in the Philippines, shown by the new treaty to be on the Portugal side of the line, would become an issue in the later decades of the sixteenth century.