* 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 ).

* December 31 – Catherine Labouré, French visionary and Saint ( b. 1806 )

Other items in the collection include diamond dress ornaments made for Catherine the Great, bracelet clasps once belonging to Marie Antoinette, and the Beauharnais emerald necklace presented by Napoleon to his adopted daughter Hortense de Beauharnais in 1806.

In 1801 he married Catherine de Lasaulx, and for some years taught at a secondary school in Koblenz ; in 1806 he moved to Heidelberg, where he lectured at the university.

In October 1806 he became the lover of a young woman named Catherine Henderson.

Saint Catherine Labouré ( May 2, 1806 – December 31, 1876 ) ( born Zoe Labouré ) was a sister of the Daughters of Charity of Saint Vincent de Paul and a Marian visionary who relayed the request from the Blessed Virgin Mary to create the Miraculous Medal worn by millions of Christians, both Roman Catholic and non-denominational.

Catherine Isabella ( 1778 – 1810 ), daughter of William Eden, 1st Baron Auckland, in July 1806.

* Saint Catherine Laboure ( 1806 – 1876 )

They moved back to the south of England for the sake of Catherine ’ s health, and settled at Bury St Edmunds from 1806 to 1816, after which they lived at Playford Hall, halfway between Ipswich and Woodbridge, Suffolk.

Born in Three Rivers, Prince Edward Island, Andrew Archibald Macdonald was descended from the Clanronald branch of the Macdonalds of the Isles, the son of Hugh and Catherine Macdonald of Panmure and grandson of Andrew Macdonald who had purchased a large tract of blumpkins in the province and, with his family and retainers, emigrated in 1806 from Inverness-shire, Scotland to settled at Three Rivers, where he and his sons carried on an extensive mercantile business for many years.

It was the birthplace of Catherine Labouré ( 1806 – 1876 ), Catholic saint.

His grandparents were John Avery ( 1807 – 1865 ) a needle maker and needle manufacturer from Headless Cross and his wife Catherine ( née Johnson ) Avery ( 1806 – 1888 ); and William Dingley ( 1801-after 1851 ), a mercer and draper from Sherbourne, Dorset and his wife Grace ( née Pease ) Dingley ( 1801-after 1851 ).

The couple had five children: Ellen, born on 30 September 1800, Robert, born on 12 December 1802, Catherine, born on 19 July 1806, Mary, born on 9 December 1809 and Matilda on 2 November 1813.

Jean-Robert Argand introduced the term " module " ' unit of measure ' in French in 1806 specifically for the complex absolute value and it was borrowed into English in 1866 as the Latin equivalent " modulus ".

The term " absolute value " has been used in this sense since at least 1806 in French and 1857 in English.

In 1806, the French chemists Louis-Nicolas Vauquelin and Pierre Jean Robiquet isolated a compound in asparagus that was subsequently named asparagine, the first amino acid to be discovered.

The monument was designed by Jean Chalgrin in 1806, and its iconographic program pitted heroically nude French youths against bearded Germanic warriors in chain mail.

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 – Battles of Pultusk and Golymin: Russian forces hold French forces under Napoleon.

In the Capitulation of Erfurt the city, its 12, 000 defenders, and the Petersberg fortress were handed over to the French on 16 October 1806.

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.

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

The Confederation of the Rhine, a confederation of client states of the First French Empire, existed from 1806 to 1813.

A pro-French Batavian Republic was established ( 1795 – 1806 ), and with the consolidation of French power under Napoleon gradually turned into a French satellite state, culminating in the Kingdom of Holland ( 1806 – 1810 ) and later simply an imperial province.

; 2nd ed., 1806 ), which was translated into French and served as a model for Wilhelm Adolf Becker's Gallus and Charicles.

Mai 1806. jpg | In this 1806 French print, the woman with the Menorah represents the Jews being emancipated by Napoleon Bonaparte

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

* 1806 – The French Army enters Berlin.

* 1806 – Believing he was facing a much larger force, Prussian Lieutenant General Friedrich von Romberg, commanding 5, 300 men, surrendered the city of Stettin to 800 French soldiers commanded by General Lassalle.

Much of Clausewitz's thinking was based on his experience as a Prussian war planner concerned with how to use popular forces in an insurrectionary struggle against the much-superior French forces which occupied Prussia after 1806 — how, in short, to wage a " Spanish War in Germany.

* 1806 – Christophe Léon Louis Juchault de Lamoricière, French general ( d. 1865 )