Events in History Feb 15 Duke Philip the Stout forms Council of Flanders Mar 4 Władysław II Jagiełło (Jogaila) crowned King of Poland May 9 Treaty of Windsor between Portugal and England (oldest diplomatic alliance in the world still in force) Jul 9 Battle at Sempach: Swiss beat duke Leopold III of Austria Oct 18 Opening of the University of Heidelberg Birthdays in History Sep 16 Ambrose Traversari, Italian theologian and monk, born in Portico di Romagna, Forlì, Papal States (d. 1439) Deaths in History Jul 9 Leopold III, Duke of Austria (1365-68), dies at 34 1385 On This Day in History 1387