* 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 ).

Clausewitz served in the Rhine Campaigns ( 1793 – 1794 ) including the Siege of Mainz, when the Prussian army invaded France during the French Revolution, and served in the Napoleonic Wars from 1806 to 1815.

Designed by Daniel Asher Alexander and constructed originally between 1806 and 1809 by local labour, to hold prisoners of the Napoleonic Wars, it was also used to hold American prisoners from the War of 1812.

The city became part of the First French Empire in 1806 as Principality of Erfurt, and was returned to Prussia in 1815 after the Napoleonic Wars.

More successful was the Greater Poland Uprising of 1806, which led to the region's becoming part of the Napoleonic Duchy of Warsaw ( forming the Poznań Department and parts of the Kalisz and Bydgoszcz Departments ).

The last Holy Roman Emperor was Francis II, who abdicated and dissolved the Empire in 1806 during the Napoleonic Wars.

In the course of the Napoleonic Wars, the fortress surrendered to French troops in 1806.

In 1806 and 1807, the British army attempted to seize Buenos Aires and Montevideo as part of the Napoleonic Wars.

In 1806 and 1807, the British ( enemies of Spain in the Napoleonic Wars ) launched the British invasions of the Río de la Plata.

With the loss of the Babenbergs Austria continued within the Holy Roman Empire becoming progressively distinct from neighbouring Bavaria under the Hapsburg Dynasty to the dissolution of the empire in 1806 in the Napoleonic Wars.

More successful was the Greater Poland Uprising of 1806, which led to the region's becoming part of the Napoleonic Duchy of Warsaw ( forming the Poznań Department and parts of the Kalisz and Bydgoszcz Departments ).

During the Napoleonic Wars, a British military expedition landed in the Cape Colony and defeated the defending Dutch forces at the Battle of Blaauwberg ( 1806 ).

When the Dutch Republic, during the Napoleonic Wars, was occupied by the French in 1795, henceforth becoming their vassal and enemy of the British, the United Kingdom invaded and occupied the Cape Colony that same year ; relinquished control of the territory in 1803 ; only to return and reoccupy the Cape on 19 January 1806.

In 1806 Łódź joined the Napoleonic Duchy of Warsaw and in 1810 it had 190 inhabitants.

The conservative character of the king, which in foreign policy up to 1806 had manifested itself in unconditional loyalty to Saxon interests, hardened even more after the experience of Napoleonic hegemony.

The rule of the Hohenzollerns over the Principality of Kulmbach-Bayreuth ended in 1806 after the defeat of Prussia by Napoleonic France.

The final Holy Roman Emperor-elect, Francis II, abdicated in 1806 during the Napoleonic Wars that saw the Empire's final dissolution.

In 1806 the city was captured by the French during the Napoleonic Wars and became part of the short-lived Napoleonic Kingdom of Westphalia in 1807.

In December 1806, A. Renodi in Paris designed arms quartering the Napoleonic eagle with the lion of the United Netherlands.

When Napoleonic troops occupied the Duchy of Saxe-Coburg in 1806 Leopold went to Paris.

Ercole died in 1803 and Breisgau passed to his daughter and her husband, who then ( 1806 ) lost it during the Napoleonic reorganization of the western territories of the defunct Holy Roman Empire to the enlarged and elevated Grand Duchy of Baden.

The Napoleonic Kingdom of Holland, a constitutional monarchy, was established by the Constitutie voor het Koningrijk Holland on 7 August 1806.

In 1806 East Frisia ( now called Oostfreesland ) was annexed by the Napoleonic Kingdom of Holland and later became part of the French Empire.

The line of " emperor-elect " rulers lasted until 1806 when Francis II dissolved the Empire during the Napoleonic Wars.

Initially known appropriately as the Achteck ( Octagon ), on 15 September 1814 it was renamed Leipziger Platz after the site of Prussia's final decisive defeat of Napoleon Bonaparte at the Battle of Leipzig, 16 – 19 October 1813, which brought to an end the Wars of Liberation that had been going on since 1806.

The history of Cape Colony from 1806 to 1870 spans the period of the history of Cape Colony during the Cape Frontier Wars, also called the Kaffir Wars, which lasted from 1811 to 1858.

During the Napoleonic Wars, Brač was conquered by the French Empire for a short time in 1806.

Arguably the first national unity government in any country was the " Ministry of All the Talents " that led the United Kingdom for about a year after the death of William Pitt the Younger in 1806, during the Napoleonic Wars.

As a result of the Napoleonic Wars, by 1806 the Holy Roman Empire was under the control of French emperor Napoleon I. Napoleon dissolved the empire ; this had broad consequences for Liechtenstein: imperial, legal and political mechanisms broke down.

Upon the dissolution of the Holy Roman Empire in 1806 and the formation of the Concert of Europe after the Napoleonic Wars, the Romantic writer Constantin Frantz during the Vormärz era developed the concept of a Central European federation overcoming the German dualism between Austria and Prussia.

Giessen was included within the Grand Duchy of Hesse, created in 1806 during the Napoleonic Wars.

Her legacy became cemented after her extraordinary 1806 meeting with French Emperor Napoleon I at Tilsit – she met with the emperor to plead unsuccessfully for favorable terms after Prussia's disastrous losses in the Napoleonic Wars.

The member states of the German Confederation feared that France was planning to annex the left bank of the Rhine, as it had sought to do under King Louis XIV, and had temporarily accomplished during the Napoleonic Wars and the implementation of the Confederation of the Rhine in 1806 – 1813.

The Battle of Maida on 4 July 1806 saw a British expeditionary force fight a First French Empire division outside the town of Maida in Calabria, Italy during the Napoleonic Wars.