Year 1493 (MCDXCIII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. Events January–December January 19 – Treaty of Barcelona: Charles VIII of France returns Cerdagne and Roussillon to Ferdinand of Aragon. March 1 – Martín Alonso Pinzón returns to the city of Bayona in Spain from the voyage of discovery, sending the first notice about the discovery to the Catholic Monarchs (Christopher Columbus is delayed by a storm in the Azores). March 4 – Christopher Columbus anchors in Lisbon and completes his February 15 letter on the first voyage conveying the news of his discoveries. March 15 – Christopher Columbus and Martín Alonso Pinzón return to Palos de la Frontera, the original port in Spain from where they started the first voyage of discovery. April 12 – Askia Mohammad I defeats Sonni Baru at the Battle of Anfao and usurps the throne of the Songhai Empire. May 4 – In the papal bull Inter caetera, Pope Alexander VI decrees that all lands discovered 100 leagues (or further west) of the Azores are Spanish. August 19 – Maximilian I succeeds his father, Frederick III, as Holy Roman Emperor. September 9 – Battle of Krbava Field in southern Croatia: Forces of the Ottoman Empire defeat those of the Kingdom of Croatia. September 24 – Christopher Columbus leaves Cádiz on his second voyage of exploration. September 26 – Pope Alexander VI issues the bull Dudum siquidem to the Catholic Monarchs, extending the grant of newly discovered lands he made them in Inter caetera. November 19 – Christopher Columbus lands on the coast of the island of Borinquen, which he renames San Juan (modern-day Puerto Rico). Date unknown England imposes sanctions on Burgundy for supporting Perkin Warbeck, the pretender to the English throne. James IV of Scotland seizes lands of John MacDonald II, putting an end to the Lord of the Isles. Huayna Capac becomes emperor of the Inca Empire. Leonardo da Vinci creates the first known design for a helicopter. Births January 2 – Louis de Bourbon de Vendôme, French cardinal (d. 1557) January 6 – Olaus Petri, Swedish clergyman (d. 1552) January 9 – Johann of Brandenburg-Ansbach, Viceroy of Valencia, German noble (d. 1525) January 25 – Maximilian Sforza, Duke of Milan (d. 1530) January 26 Min Bin, king of Arakan (d. 1554) Giovanni Poggio, Italian cardinal and diplomat (d. 1556) Ippolita Maria