Timeline March 1539

Events in March 1539 3

• 1539 Isabella Jagiellon marries John Zapolya Polish princess weds the King of Hungary Isabella Jagiellon, daughter of Sigismund I of Poland, married John Zapolya, King of Hungary, in a ceremony at Szekesfehervar. The alliance linked the Polish and Hungarian royal houses amid Hungary's ongoing partition between Habsburg and Ottoman-backed rule.
• 1539 Marcos de Niza sets out in search of Cibola Franciscan friar's expedition inspires the later search for the Seven Cities Fray Marcos de Niza departed Culiacan with the guide Estevanico to scout lands north of New Spain for viceroy Antonio de Mendoza. His reports of a wealthy city, later disputed as exaggerated, helped prompt the Coronado expedition the following year.
• 1539 Tartaglia shares his solution to the cubic equation Mathematician Gerolamo Cardano receives the formula under oath of secrecy Niccolo Tartaglia disclosed his method for solving cubic equations to Gerolamo Cardano, who swore an oath to keep it secret. Cardano later published the formula regardless, triggering a bitter priority dispute that still colors the formula's attribution today.