Jul 15Battle of Grunwald (First Battle of Tannenburg, Battle of Žalgiris), one of Medieval Europe's largest battles during Poland-Lithuanian Teutonic War. Polish King Władysław Jagiełło and Lithuanian Grand Duke Vytautas defeat Teutonic Ulrich von Jungingen
Oct 9 Earliest mention of Prague's astronomical clock, the world's oldest still in operation, built by Mikuláš of Kadaň and Jan Šindel