Immediate resistance to the French advance was restricted to the outpost divisions of Nordmann and Johann von Klenau ; the main Habsburg army was stationed five miles ( 8 km ) away, centred on the village of Wagram.

* 1820 – Johann Joachim Eschenburg, German literary critic ( b. 1743 )

In 1819 – 1820, Johann Baptist von Spix and Carl Friedrich Philipp von Martius were engaged in an expedition to Brazil, and on their return to Europe, amongst other collections of natural objects they brought home an important set of the fresh water fish of Brazil, and especially of the Amazon River.

The earliest galvanometer was reported by Johann Schweigger at the University of Halle on 16 September 1820.

The first white man known to arrive was a German, Johann Schoonover, who lived for a short time on the creek later named for him to trade with the Indians, about 1820.

The only interruptions occurred in 1813-1814, occasioned by the German War of Liberation ( War of the Sixth Coalition ), during which the university was closed, and those occasioned by two prolonged literary tours, first in 1820 to Paris, London and Oxford with his colleague Johann Karl Thilo ( 1794 – 1853 ) for the examination of rare oriental manuscripts, and in 1835 to England and the Netherlands in connection with his Phoenician studies.

Johann Joachim Eschenburg ( December 7, 1743 – February 29, 1820 ) was a German critic and literary historian.

The islands were named the Gilbert Islands in 1820 by a Russian admiral, Johann von Krusenstern, and French captain Louis Duperrey, after a British captain, Thomas Gilbert, who crossed the archipelago in 1788.

The Zugspitze was first conquered on 27 August 1820 by Josef Naus, his survey assistant, Maier, and mountain guide, Johann Georg Tauschl.

The first recorded ascent of the Zugspitze was achieved on 27 August 1820 by Lieutenant Josef Naus and mountain guide, Johann Georg Tauschl together with Naus ' survey assistant and batman ( servant ), Maier.

The son of Joseph Franz Weigl ( 1740 – 1820 ), the principal cellist in the orchestra of the Esterházy family, he was born in Eisenstadt and studied music under Johann Georg Albrechtsberger and Antonio Salieri.

While residing in Switzerland, he became impressed with what is now called the Pestalozzi School System, from Swiss pedagogist Johann Heinrich Pestalozzi ( 1746 – 1827 ) in France during the Napoleonic ephemeral Empire and then in Alicante, Spain, during the three years, between 1820 and 1823, known as the Constitutional Period.

******* Johann Michael Bach III ( 1745 – 1820 )-the music theorist

The disease is named after Eduard Heinrich Henoch ( 1820 – 1910 ), a German pediatrician, and his teacher Johann Lukas Schönlein ( 1793 – 1864 ), who described it in the 1860s.

As of 1820 he was on friendly terms with Johann Wolfgang von Goethe.

The decrees were the subject of Johann Joseph von Görres ' pamphlet Teutschland Deutschland und die Revolution ( Germany and the Revolution ) ( 1820 ), in which he concluded that it was both impossible and undesirable to repress the free utterance of public opinion by reactionary measures.

* Johann Christoph Georg Schiedmayer (* 1740 ; † 1820 ), master joiner, builder of organs and other music instruments

He hosted and entertained foreign naturalists and scientists, such as Johann Baptist von Spix ( 1781-1826 ) and Carl Friedrich Philipp von Martius ( 1794-1868 ), and explored the flora, fauna and geography of the province of Minas Gerais with French naturalist Augustin Saint-Hilaire from 1813 to 1820.

* Amalie Hofer, née Weissenrieder ( 1820 – 1872 ), wife of Johann Hofer, Forty-Eighters

: To be distinguished from Johann Michael Bach ( 1745 – 1820 )

He is sometimes referred to as the " Gehrener Bach " to distinguish him from the " Wuppertaler Bach ", Johann Michael Bach ( 1745 – 1820 ).

His collected works were published in Leipzig in eight volumes ( 1811 – 1839 ), with a biography by Johann E. von Gruner in volume 8 ( 1820 ), and again in 1856.

According to the dating up to now accepted by the majority of Czech authors, Božena Němcová was born in 1820 as Barbara Pankel ( or Barbora Panklová according to the usual Czech name-giving for women ) in Vienna as a daughter of Johann Pankel from Lower Austria and Teresie Novotná, a maid of Bohemian origin.

* 1660 – Johann Kuhnau, German composer, organist and harpsichordist ( d. 1722 )

* 1710 – Johann Kaspar Basselet von La Ros &# 233 ; e, Bavarian general ( d. 1795 )

* 1730 – Johann Georg Hamann, German philosopher ( d. 1788 )

* 1648 – Johann Michael Bach, German composer ( d. 1694 )

* 1672 – Johann Jakob Scheuchzer, Swiss scholar ( d. 1733 )

* 1811 – First ascent of Jungfrau, third highest summit in the Bernese Alps by brothers Johann Rudolf and Hieronymus Meyer.

* 1761 – Johann Matthias Gesner, German scholar ( b. 1691 )

In the Battle of Abensberg on 19 – 20 April 1809, Napoleon gained a significant victory over the Austrians under Archduke Louis of Austria and General Johann von Hiller.

* 1697 – Johann Gottlieb Görner, German composer and organist ( d. 1778 )

* 1736 – Johann Christoph Kellner, German organist and composer ( d. 1803 )

* 1647 – Johann Heinrich Acker, German writer ( d. 1719 )

* 1744 – Johann Gottfried Herder, German writer ( d. 1803 )

* 1719 – Johann Wilhelm Ludwig Gleim, German poet ( d. 1803 )

* 1749 – Johann Wolfgang von Goethe, German writer and scientist ( d. 1832 )

* 1683 – Johann David Heinichen, German composer and theorist ( d. 1729 )

* 1667 – Anna Maria Luisa de ' Medici, Italian wife of Johann Wilhelm, Elector Palatine ( d. 1743 )

* 1613 – Christoph Bach, court musician, grandfather of Johann Sebastian Bach ( d. 1661 )

* 1658 – Johann Wilhelm, Elector Palatine ( d. 1716 )

* 1637 – Johann Gerhard, German church leader and theologian ( b. 1582 )

* 1727 – Premiere of Johann Sebastian Bach's St Matthew Passion BWV 244b at the St. Thomas Church, Leipzig

* 1719 – Johann Gottlob Lehmann, German mineralogist and geologist ( d. 1767 )

** 1802 – 1803 Johann Heinrich Rothpletz ( b. 1766 – d. 1833 )

** 10 March 1803 – 26 April 1803 Johann Rudolf Dolder ( b. 1753 – d. 1807 )