January 1 Portuguese navigators discover Rio de Janeiro February 25 Austrian emperor Maximilian I reformats government machine March 11 Tebriz, shah Ismail I of Persia crowned May 9 Columbus left Spain on his 4th and final trip to New World May 11 Columbus begins 4th and last trip to "Indies" May 21 Portuguese Admiral Da Nova discovers St. Helena June 19 Emperor Maximilian I and England sign treaty of Antwerp August 8 Jacobus IV of Scotland marries Margaretha Tudor September 18 Christopher Columbus lands at Costa Rica on his 4th and last voyage October 16 Storm ravages Friese coast December 31 Cesare Borgia (son of pope Alexander VI) occupies Urbino
