January 17 Cesare Borgia returns in triumph to Rome from Romagna April 23 Portuguese navigator Pedro Cabral and 6 ships return to Lisbon May 20 Joao da Nova Castell discovers Ascension Islands July 15 Explorer Pedro Cabral back in Lisbon July 27 Copernicus formally installed as canon of Frauenberg Cathedral October 13 Maximilian of Austria and Louis XII sign Treaty of Trente October 15 English crown prince Arthur marries Catharina of Aragon November 4 Philip de Blank and Juana "la Loca" depart to Spain