* 1723 – Mathurin Jacques Brisson, French naturalist ( d. 1806 )

* 1806 – Francis II, the last Holy Roman Emperor, abdicates ending the Holy Roman Empire.

* 1806 – Battle of Mišar during the Serbian Revolution begins.

* 1806 – Santiago de Liniers, 1st Count of Buenos Aires re-takes the city of Buenos Aires, Argentina after the first British invasion.

* 1724 – George Stubbs, English painter ( d. 1806 )

* Anton Alexander Graf von Auersperg ( 1806 – 1876 ) – Austrian poet who wrote under the pseudonym of Anastasius Grün.

The Lewis and Clark Expedition spent the winter of 1805 – 1806 at Fort Clatsop, a small log structure south and west of modern day Astoria.

* 1806 – Michael Haydn, Austrian composer ( b. 1737 )

* 1727 – Michel Adanson, French botanist ( d. 1806 )

* William Bernard Ullathorne ( 1806 – 89 )

Following his conquest of most of Western Europe, the first Napoleon made his elder brother Joseph ( 1768 – 1844 ) king first of Naples ( 1806 – 1808 ) and then of Spain ( 1808 – 1813 ), his third brother Louis ( 1778 – 1846 ) king of Holland ( 1806 – 1810 ) ( subsequently forcing his abdication after his failure to subordinate Dutch interests to those of France ) and his youngest brother Jérôme Bonaparte ( 1784 – 1860 ) king of Westphalia, the short-lived realm created from some of the states of northwestern Germany ( 1807 – 1813 ).

After 1806, the First Lord of the Admiralty was always a civilian, while the professional head of the navy came to be ( and is still today ) known as the First Sea Lord.

After this Anton became, officially, the Heir to the Electorate and, since 1806, the Kingdom of Saxony.

After the general meeting in 1806, Thompson travelled to Rocky Mountain House and prepared for an expedition to follow the Columbia River to the Pacific.

" After the dissolution of the Holy Roman Empire in 1806, Francis continued to rule as Austrian Emperor.

After 1806 he used the titles: " We, Francis the First, by the grace of God Emperor of Austria ; King of Jerusalem, Hungary, Bohemia, Dalmatia, Croatia, Slavonia, Galicia and Lodomeria ; Archduke of Austria ; Duke of Lorraine, Salzburg, Würzburg, Franconia, Styria, Carinthia and Carniola ; Grand Duke of Cracow ; Grand Prince of Transylvania ; Margrave of Moravia ; Duke of Sandomir, Masovia, Lublin, Upper and Lower Silesia, Auschwitz and Zator, Teschen and Friule ; Prince of Berchtesgaden and Mergentheim ; Princely Count of Habsburg, Gorizia and Gradisca and of the Tirol ; and Margrave of Upper and Lower Lusatia and in Istria ", President of the German Confederation.

After the 13th century, the relevance of the Reichsgut faded, even though some parts of it did remain until the Empire's end in 1806.

After the abolition of the Holy Roman Empire in August 1806, the electors continued to reign over their territories, many of them taking higher titles.

After the Louisiana Purchase by the United States in 1803, this indefinite nature of the boundary between the U. S. and Spain led to an agreement on November 6, 1806, negotiated by Gen. James Wilkinson and Lt. Col. Simón de Herrera, to establish a neutral territory on both sides of the river.

After the death of Charles Hardenbergh in 1806, Truth, known as Belle, was sold at an auction.

After defeating Prussian forces at Battle of Jena-Auerstedt | Jena, the French Army entered Berlin on 27 October 1806

After his father's death in 1806, Webster handed over his practice to his older brother Ezekiel, who had by this time been admitted to the bar.

After a devastating measles epidemic that reduced the mission population by one quarter in 1806, people from more distant areas and new language groups began to join the Mission San Jose community.

After selling much of his farm to the Ellicotts and others, he died in his log cabin nine years later on October 9, 1806, exactly one month before his 75th birthday.

After his wife Sophie died in 1806 he married a second time in 1807 to Auguste Busmann.

" After Imperial confirmation the ukaz was heard in the Senate and on 19 October 1806 was sent for execution to the main office of the Russian-American Company, ( RAC ) and also to the Admiralty and Commerce colleges "

After defeating Prussian forces at Battle of Jena-Auerstedt | Jena, the French Army entered Berlin on 27 October 1806

After Pitt's death in January 1806, Fox served briefly as Foreign Secretary in the ' Ministry of All the Talents ' of William Grenville, before he died on 13 September 1806, aged fifty-seven.

After Pitt's death in 1806, Castlereagh resigned amid the chaos of the Ministry of All the Talents.

After the 1806 Prussian defeat at the Battle of Jena-Auerstedt, Napoleon was the first to use the Brandenburg Gate for a triumphal procession and took its Quadriga to Paris.

After Prussia's defeat at the hands of Napoleon in 1806, the territory was lost under the terms of the Treaty of Tilsit and included within the new Kingdom of Westphalia.

After travelling, in 1806 he became professor of philosophy and elementary mathematics at the University of Heidelberg.

After studying in Leipzig and at the University of Göttingen he visited England in the summer of 1806, carrying a letter of introduction from the naturalist Johann Friedrich Blumenbach to Sir Joseph Banks, who, with the other members of the African Association, accepted his offer in 1809 to launch an expedition to discover the source of the River Niger.

After attending the St Petersburg school of cadets, he accompanied Adam Johann von Krusenstern on his voyage of 1803 – 1806.

In 1806, President Thomas Jefferson commissioned the Red River Expedition to explore parts of the new lands of the Louisiana Purchase by traveling up the Red River.

After traveling thousands of miles, in 1806 the expedition returned to the Mandan villages in present-day North Dakota.

Von Platen himself extolled the modernising virtues of the canal in 1806, claiming that mining, agriculture and other industries would benefit from " a navigation way through the country.

Dundas put a brake on intellectual and social change through his ruthless manipulation of patronage in alliance with Prime Minister William Pitt the Younger, until he lost power in 1806.

In 1806, a Fourth Coalition was set up, on 14 October Napoleon defeated the Prussians at the Battle of Jena-Auerstedt, marched through Germany and defeated the Russians on 14 June 1807 at Friedland.

Lewis and Clark passed through the valley on the return trip from the Pacific in 1806 also.

Donizetti was not especially successful as a choirboy, but in 1806 he was one of the first pupils to be enrolled at the Lezioni Caritatevoli school, founded by Mayr, in Bergamo through a full scholarship.

In 1806 – 1807, while at Auteuil, he first appeared before the public as a poet, with two pieces, one entitled Urania, in the classical style, of which he became later the most conspicuous adversary, the other an elegy in blank verse, on the death of Count Carlo Imbonati, from whom, through his mother, he inherited considerable property, including the villa of Brusuglio, thenceforward his principal residence.

In 1806 a Federal Road from Savannah, Georgia to Knoxville, Tennessee was built through Cherokee land.

In the period from 1806 to 1810, the Hartford and Dedham Turnpike was built ( now Route 109 ), nearly going broke in attempting to build a causeway over the Charles River at the Medfield town line and through the Great Black Swamp.

The Red River Expedition of 1806 which passed through Bowie County, headed by Thomas Freeman and Dr. Peter Custis, was of great diplomatic and economic importance to President Thomas Jefferson.

Mining began in 1806 and continued at least through the end of the War of 1812, which ended in 1815.

In 1806, Zebulon Pike led the Pike expedition westward from St Louis, Missouri, of which part of their journey followed the Cottonwood River through Marion County near the current towns of Florence, Marion, Durham.

In 1806, Zebulon Pike led the Pike expedition westward from St Louis, Missouri, of which part of their journey followed the Cottonwood River through Lyon County.

In 1806, Zebulon Pike led the Pike expedition westward from St Louis, Missouri, of which part of their journey followed the Cottonwood River through Chase County.

He continued to exhibit at the Academy until 1806, and also went on several extended drawing trips through England and Wales.

In 1806, Zebulon Pike led the Pike expedition westward from St Louis, Missouri, of which part of their journey followed the Cottonwood River through Marion County near the current towns of Florence, Marion, Durham.

Main Street spread to the west with construction of the National Pike through the town in 1806 ; the telegraph lines from Frederick to Hagerstown were routed through Middletown in 1854 ; and in 1896, car 11 of the Frederick Middletown Railway made its first run to Middletown.

* Captain William Clark led part of the Lewis and Clark Expedition through this area on the Yellowstone River in 1806

In 1806, William Clark traveled through the region on the Lewis and Clark Expedition.

These people, which originally included bands of Palouse, Yakamas, Umatilla, Walla Walla and Wanapum, were collectively renamed Nez Perce by Lewis and Clark when they passed through the Walla Walla Valley on their return Journey in 1806.

Though Fox would die before abolition was formalised, he oversaw a Foreign Slave Trade Bill in spring 1806 that prohibited British subjects from contributing to the trading of slaves with the colonies of Britain ’ s wartime enemies, thus eliminating two-thirds of the slave trade passing through British ports.

Napoleon passing through the Brandenburg Gate after the battle of Jena-Auersted ( 1806 ) The Gate's design is based upon the Propylaea, the gateway to the Acropolis in Athens, Greece and is consistent with Berlin's history of architectural classicism ( first, Baroque, and then neo-Palladian ).

From the end of 1806 through June 1807, Ostrołęka was occupied by French troops.

In 1804 through the influence of Prince Adam Czartoryski he entered the Russian diplomatic service, and was employed in 1805 as Russian commissioner with the Anglo-Neapolitan, and in 1806 with the Prussian army.