* 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 ).

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 ).

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.

In October 1806, Frederick William participated in the Battle of Jena-Auerstädt as a major general of the Prussian army, of which his father was the field marshal.

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.

* 1806 – Napoleonic Wars: Forces of the British Empire lay siege to the port of Boulogne in France by using Congreve rockets, invented by Sir William Congreve.

* 1806 – Prussia declares war on France.

Elected president in what Jefferson called the Revolution of 1800, he oversaw the purchase of the vast Louisiana Territory from France ( 1803 ), and sent the Lewis and Clark Expedition ( 1804 – 1806 ) to explore the new west.

At the peace of Basel in 1795 the whole of the left bank of the Rhine was resigned to France, and in 1806 the Rhenish princes all joined the Confederation of the Rhine.

( Piecemeal over the next centuries most of the former Kingdom of Arles was incorporated into France – but King of Arles remained one of the Holy Roman Emperor's subsidiary titles until the dissolution of the Empire in 1806.

Within months of the collapse of the Third Coalition, the Fourth Coalition ( 1806 – 07 ) against France was formed by Prussia, Russia, Saxony, Sweden, and the United Kingdom.

Opinion shifted in favor of canned meats, by a process invented in France in 1806.

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

From 1806, the city became part of France.

In 1806, Louis called for his son to be sent to him in Holland, but he was again refused by Hortense, who believed that her son would never be returned to France.

In 1806, Napoleon I of France conquered the Holy Roman Empire.

Prussia saw these and other moves as an affront to its status as the main power of Central Europe and it went to war with France in 1806.

In his honor, a bronze memorial was erected in the Louisana State Museum with the inscription: " To honor Norbert Rillieux, born at New Orleans, Louisiana, March 18, 1806 and died at Paris, France, October 8, 1894.

Ludwig strongly rejected the alliance of his father with Napoleon I of France but in spite of his anti-French politics the crown prince had to join the emperor's wars with allied Bavarian troops in 1806.

On 26 December 1805, Napoleon I of France declared Ferdinand deposed again and replaced him with his own brother Joseph Bonaparte on 30 March 1806.

In 1804 he was for a short time deprived of the reins of government at the demand of France ; but he was speedily restored to his former position, which he held till, in February 1806, on the entry of the French into Naples, he had to flee with the royal family into Sicily.

Prussia saw these and other moves as an affront to its status as the main power of Central Europe and it went to war with France in 1806.

The Arch of Titus has provided the general model for many of the triumphal arches erected since the 16th century — perhaps most famously it is the inspiration for the 1806 Arc de Triomphe in Paris, France, completed in 1836.

* The Arc de Triomphe ( 1806 ), Paris, France

The Canadian fur trade began to change in 1806, after Napoleon Bonaparte ordered the blockade of the Baltic Sea as part of the ongoing struggle between France and Britain for world dominance.

While engaged in this great work Ersch also planned La France littéraire, which was published at Hamburg in 5 vols, from 1797 to 1806.