1503 (MDIII) was a common year starting on Thursday (see link for calendar) of the Gregorian calendar.

Events

• January 20 - Seville in Castile is awarded exclusive right to trade with the New World.
• April 21 - Battle of Cerignola. Aragonese forces under Gonzalo Fernández de Córdoba defeat the French under the Duc de Nemours, who is killed. Considered to be the first battle in history won by gunpowder small arms.
• May 10 - Christopher Columbus discovers the Cayman Islands and he names them Las Tortugas after the numerous sea turtles there.
• May 13 - Capture of Naples by the Spanish.
• May 28 - James IV of Scotland and Margaret Tudor are married by Pope Alexander VI according to Papal Bull.
• May 28 - The Treaty of Everlasting Peace between Scotland and England is signed, which would actually last 10 years.
• July 23 - Orbital calculations suggest that on this day Pluto moved outside Neptune's orbit, remaining there for 233 years.
• August 8 - King James IV of Scotland marries Margaret Tudor, daughter of King Henry VII of England at Holyrood Abbey, Edinburgh, Scotland.
• September 22 - Francesco Todeschini Piccolomini becomes Pope Pius III succeeding Pope Alexander VI, but dies on October 18.
• December 29 - Battle of the Garigliano - Spanish forces under Cordoba defeat a French-Italian mercenary army under the Marquis of Saluzzo. The French forces withdraw to Gaeta.
• Giuliano della Rovere becomes Pope Julius II succeeding Pope Pius III.
• Leonardo da Vinci starts work on the Mona Lisa.
• Perpendicular style chapel added to Westminster Abbey.
• Battle of Ruvo - French-Spanish Wars in Italy.
• Vasco da Gama established India's first Portuguese fortress at Cochin.
• Mariotto Albertinelli paints his masterpiece, the "Visitation of the Virgin".

Births

• January 11 - Girolamo Francesco Maria Mazzola, Italian artist (d. 1540)
• March 10 - Ferdinand I, Holy Roman Emperor (died 1564)
• March 22 - Antonio Francesco Grazzini, Italian writer (died 1583)
• June 1 - Wilhelm von Grumbach, German adventurer (died 1567)
• June 28 - Giovanni della Casa, Italian poet (died 1556)
• June 30 - John Frederick, Elector of Saxony (died 1554)
• August 12 - Christian III of Denmark and Norway (died 1559)
• November 17 - Agnolo di Cosimo, Italian artist and poet (d. 1572)
• December 14 - Nostradamus, French physician and prophet (died 1566)
• Nicholas Bourbon, French poet
• Lucas David, Prussian historian (died 1583)
• Robert Estienne, French printer (died 1559)
• Charles Etienne, French anatomist (died 1564)
• John Frith, English protestant priest and martyr (died 1533)
• Henry II of Navarre (died 1555)
• Shimazu Katsuhisa, Japanese nobleman
• Parmigianino, Italian painter (died 1540)
• Garcilaso de la Vega, Spanish poet (died 1536)

Deaths

• February 11 - Elizabeth of York, queen of Henry VII of England (born 1466)
• May 20 - Lorenzo di Pierfrancesco de' Medici, Italian patron of the arts (b. 1463)
• June 30 - Pierre d'Aubusson, Grand Master of the Knights of Rhodes (born 1423)
• August 18 - Pope Alexander VI (born 1431)
• October 18 - Pope Pius III (born 1439)
• November 23 - Margaret of York, wife of Charles I, Duke of Burgundy (b. 1446)
• December 28 - Piero di Lorenzo de' Medici, ruler of Florence (born 1471)
• Richard Amerike, English merchant and patron of John Cabot (born 1445)
• Peter II, Duke of Bourbon (born 1438)
• Reginald Bray, British courtier (born 1440)
• Edward Story, Bishop of Carlisle and Chichester

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