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

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

* 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 ).

At the Battle of Jena-Auerstedt on October 14, 1806 – when Napoleon invaded Prussia and defeated the massed Prussian-Saxon army commanded by Karl Wilhelm Ferdinand, Duke of Brunswick – he was captured, one of the 25, 000 prisoners captured that day as the Prussian army disintegrated.

He wished to maintain his and his family's Imperial status in the event that the Holy Roman Empire should be dissolved, as it indeed was in 1806 when an Austrian-led army suffered a humiliating defeat at the Battle of Austerlitz.

* 1806 – Battle of San Domingo: British naval victory against the French in the Caribbean.

Francis II () ( 12 February 1768 – 2 March 1835 ) was the last Holy Roman Emperor, ruling from 1792 until 6 August 1806, when he dissolved the Holy Roman Empire after the disastrous defeat of the Third Coalition by Napoleon at the Battle of Austerlitz.

Napoleon easily crushed it at the Battle of Jena ( 1806 ).

* 1806 – Battle of Jena-Auerstädt France defeats Prussia.

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.

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.

Two of his most successful paintings, Bonaparte Visiting the Plague Victims of Jaffa ( 1804 ) and Battle of Abukir ( 1806 ) focus on the Emperor, as he was by then, but include many Egyptian figures, as does the less effective Napoleon at the Battle of the Pyramids ( 1810 ).

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 ).

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

* 1806 – The Battle of Trafalgar, as Seen from the Mizen Starboard Shrouds of the Victory, oil on canvas – Tate Gallery, London

During the Russo-Turkish War of 1806 – 1812, Admiral Senyavin won the naval Battle of Lemnos off the coast.

**** Charles William Ferdinand, Duke of Brunswick ( 1735 – 1806 ), Charles ' I son, killed at the Battle of Jena-Auerstedt

The county is named for Robert McAlpin Williamson ( 1806 ?– 1859 ), a community leader and veteran of the Battle of San Jacinto.

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

It was in nearby Lübeck-Ratekau that Blücher, who was actually born in Rostock and who was one of few generals to fight on after the Battle of Jena, surrendered to the French in 1806.

Following the Battle of Austerlitz in December 1805, The Holy Roman Empire was dissolved on 6 August 1806 when the last Holy Roman Emperor Francis II abdicated, following a crushing defeat at the Battle of Austerlitz by the French under Napoleon resulting in the Treaty of Pressburg, and sixteen of France's allies among the German states ( including Bavaria and Württemberg ) established the Confederation of the Rhine in July 1806.

Following the Battle of Jena-Auerstedt of October 1806 in the War of the Fourth Coalition, various other German states, including Saxony and Westphalia, also joined the Confederation.

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.

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.

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

* 1806 – British forces take Buenos Aires during the first British invasions of the Río de la Plata.

* 1806 – Juan Seguín, Tejano commander during Texas Revolution ( d. 1890 )

Translated into English by D. D. Davis as Treatise on Insanity in 1806, it is influential on both sides of the Atlantic during the nineteenth century.

Partly destroyed by natural disasters and rebuilt several times during the following 200 years, and hit by Caragea's plague in 1813 – 1814, the city was wrested from Ottoman control and occupied at several intervals by the Habsburg Monarchy ( 1716, 1737, 1789 ) and Imperial Russia ( three times between 1768 and 1806 ).

As a reward for his services at Austerlitz ( 2 December 1805 ) he became the 1st Sovereign Prince of Ponte Corvo ( 5 June 1806 ), but during the campaign against Prussia, in the same year, was severely reproached by Napoleon for not participating with his army corps in the battles of Jena and Auerstädt, though close at hand.

It underwent a dramatic revival during the 19th century ; from a population of 5, 000 in 1806, it grew into a city of over 200, 000 inhabitants by 1882, and is now home to over four million people.

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.

One was Humphrey Marshall, an " aristocratic lawyer who possessed a sarcastic tongue ," who had been hostile toward Clay in 1806 during the trial of Aaron Burr.

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.

Initial United States contact with the Lakota during the Lewis and Clark Expedition of 1804 – 1806 was marked by a standoff.

Mariner described his experiences during the years he was the adopted son of ' Ulukalala ( 1806 – 1810 ).

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.

A total of 20, 355 natives were " attached " to the California missions in 1806 ( the highest figure recorded during in the Mission Period ); under Mexican rule the number rose to 21, 066 ( in 1824, the record year during the entire era of the Franciscan missions ).

* was a sloop constructed in 1806 and captured during the War of 1812

He attempts to escape four times, in 1800 ( shortly before he was due to be released anyway ), 1802, 1806 and 1809, each time his sentence is lengthened by three years ; he also receives an extra two years for once resisting recapture during his second escape.

The Embargo of 1807 was a series of laws passed by the U. S. Congress 1806 – 1808, during the second term of President Thomas Jefferson.

Ultimately, the actual experience of successfully defending without Spanish aid the viceroyalty from a foreign invader during the 1806 – 1807 British invasions of the Río de la Plata, triggered a decisive quest for even greater autonomy from the colonial metropolis.

Control of Osnabrück passed to the Electorate of Hanover in 1803 during the German Mediatisation and then briefly to the Kingdom of Prussia in 1806.

In 1801 the first great school of dermatology became a reality at the famous Hôpital Saint-Louis in Paris, while the first textbooks ( Willan's, 1798 – 1808 ) and atlases ( Alibert's, 1806 – 1814 ) appeared in print during the same period of time.

Meriwether Lewis ate bitterroot in 1805 and 1806 during the Lewis and Clark Expedition.