Treaty of Tordesillas
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 Portuguese Empire and the Spanish Empire, 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 and the islands visited by Christopher Columbus on his first voyage, named in the treaty as Cipangu and Antillia.
https://en.wikipedia.org/wiki/Treaty_of_Tordesillas