Spice Islands
After having his proposed expeditions to the Spice Islands repeatedly rejected by King Manuel of Portugal, Magellan renounced his Portuguese nationality and turned to Charles I, the young King of Spain (and future Holy Roman Emperor). Under the 1494 Treaty of Tordesillas, Portugal controlled the eastern routes to Asia that went around Africa. Magellan instead proposed reaching the Spice Islands by a western route, a feat which had never been accomplished. Hoping that this would yield a commercially useful trade route for Spain, Charles approved the expedition, and provided most of the funding.