Year 1460 was a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar. Events of 1460 The first Portuguese navigators reach the coast of modern Sierra Leone. March 5 - King Christian I of Denmark issues the Treaty of Ribe. March 6 - Treaty of Alcacovas: Portugal gives Castile the Canary Islands in exchange for claims in West Africa. March 7 - The Bavarian original formula is discovered in Dortmund, Germany. May 4 - Portuguese navigators Diogo Gomes an… (More on 1460)