December 20 is the 354th day of the year according to the Gregorian calendar (355th in the leap year). There are 11 days left until the end of the year.
1100 - Břetislav II., Czech prince, was mortally wounded in the woods near Zbečno, where he died two days later.
1409 - Pope Alexander V, at the request of Archbishop Zbyněk Zajíc of Hazmburk, banned preaching in private chapels in Bohemia. Above all, they wanted to prevent Jan Hus from preaching in the Bethlehem Chapel
1915 - The Austro-Hungarian film Thanks to the War Orphan was shot in Prague. The cameras stood in Troja near the chateau, on boats on the Vltava River and in the trenches specially excavated for the film.
1989 - The 18th Extraordinary Congress of the Communist Party was launched in Prague, which later adopted an action program called For a Democratic Socialist Society and indicated the intention to transform the Communist Party into a regular democratic party.
2000 - A crisis breaks out on Czech Television.
2016 - A robber attacked Petra Kvitová in her apartment in Prostějov and caused her a serious hand injury.
2018 - A methane explosion at the ČSM Mine in Stonava in the Karviná region claimed 13 dead and three seriously injured miners.
1046 - German King Henry III. Black recalled Pope Gregory VI, Benedict IX. and New Year's Eve III. and appointed Bishop Siutger as Pope Clement II.
1192 - English King Richard the Lionheart is captured in Vienna
1860 - South Carolina breaks away from the United States, leading to the American Civil War.
1917 - ČEKA, the first Soviet secret police, is founded.
1924 - Adolf Hitler sentenced to five years in prison for high treason and was released on parole in Landsberg.
1944 - The Siege of Bastogne begins, one of the most important engagements during the Battle of the Bulge.
1951 - The first electricity generated by nuclear power at the EBR-1 reactor in Idaho Falls, USA.
1999 - Portugal transfers sovereignty over Macau to the People's Republic of China.
2000 - The anthem of the Russian Federation is adopted on the initiative of Russian President Putin.
2016 - A 14.5 km long double-decker Eurasian road tunnel opens in Istanbul, connecting the European and Asian continents. The construction lasted less than 5 years and cost $ 1.2 billion.
1576 - Saint John Sarkander, Moravian Catholic priest († March 17, 1620)
1729 - František Xaver Pokorný, violinist and composer († July 2, 1794)
1754 or 1757 - Joseph Schubert, German violinist, violist and composer of Czech origin († July 28, 1837)
1783 - Jan Evangelista Andres, apothecary and amateur playwright († July 17, 1825)
1784 - George William of Schaumburg-Lippe, the first prince of the German principality of Schaumburg-Lippe († November 21, 1860)
1793 - Gregor Wolný, Benedictine, historian, writer and high school teacher († May 3, 1871)
1810 - Emanuel Heinrich Komers, Austrian Minister of Justice († 18 January 1889)
1814 - Václav Svatopluk Štulc, priest and writer († August 9, 1887)
1819 - Václav Šimerka, priest, mathematician, physicist and philosopher († December 26, 1887)
1836 - Arnošt Freissler, physician († 19 April 1908)
1837 - Anton Foerster, Czech composer, conductor and music pedagogue († June 17, 1926)
1848 - Hans Watzek, Austrian photographer born in Bohemia († May 12, 1903)
1850 - František Šípek, comedian and director († January 27, 1906)
1874 - Václav Posejpal, physicist († April 8, 1935)
1877 - Viliam Pauliny, Czechoslovak economist and politician († 1945)
1881 - Tomáš Koupal, Catholic priest, historian († August 8, 1952)
1883 - Otakar Hřímalý, composer and pedagogue († July 10, 1945)
1884 - Tomáš Dytrych, Czechoslovak politician († May 12, 1951)
1886 - Karel Schinzel, engineer, chemist and inventor († November 23, 1951)
1890 - Jaroslav Heyrovský, chemist, Nobel laureate c