* 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 ).

In 1806, the French occupants of the Netherlands downgraded Utrecht University to an école secondaire ( high school ), but after the establishment of the Kingdom of the Netherlands in 1813 it regained its original status.

In 1806, French army officer José de la Baume, who later joined the Spanish army, was rewarded for his services to Spain with title to of Texas land, the original El Capote Ranch.

The original town was divided and sub-divided into many other towns in the region, including all of the towns of Fabius ( 1798 ), Tully, Preble, and Scott ( the latter two now in Cortland County ), along with parts of the towns of Spafford, Otisco ( 1806 ), LaFayette ( 1825 ), Onondaga ( 1794 ), Truxton and Cuyler ( the latter two now in Cortland County ).

A fire in March 1806 destroyed the original Court House.

The hotel contains a 130-seat restaurant along with a fully restored colonial-style tavern in the Stone House, with original, massive stone walls and beams dating to 1806.

In 1806 he undertook the revision of the Roman liturgical chants in the hope of discovering and establishing their original form.

He managed the original Theatre Royal, Newcastle for fifteen years ( 1791 – 1806 ).

This original design was first flown on March 12, 1806 at Jacmel, Haiti as Miranda's expedition prepared to make the final leg of its voyage to Venezuela.

Quarenghi's original design for the Smolny Institute ( 1806 ).

The original song, Glory to the Sun, was recorded by Nikolay Lvov and Jan Prac ; sheet music was published in 1790 ( second edition 1806 ), verses in 1770s.

Designed in 1806 by Maximilian Godefroy, a renowned French architect, the original chapel stands adjacent to the Mother Seton House.

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.

In 1857, a Lower Education law replaced the 1806 law supplementing the mandatory curriculum with geometry, geography, history, natural sciences, and singing.

Archibald Acheson, 2nd Earl of Gosford GCB ( 1 August 1776 – 27 March 1849, Markethill ), styled The Honourable Archibald Acheson from 1790 to 1806 and Lord Acheson from 1806 to 1807, was a British politician who served as Lieutenant-Governor of Lower Canada and Governor General of British North America in the 19th century.

Christian Lower ( DR ), died December 19, 1806, vacant thereafter

The General Wayne Inn in Lower Merion Pennsylvania also served as a post office from 1830 to 1850 and was also the polling place in 1806.

* Minor trouble arises after 1806 when a governor attempts to anglicize Lower Canada, but he is able to quell dissent if not to achieve his goal.

* 1806 – New Brunswick, Prince Edward Island, Newfoundland and the Canadas ( Upper Canada, Lower Canada ) – 391, 899

Le Canadien () was a French language newspaper published in Lower Canada from November 22, 1806 to March 14, 1810.

He was editor and publisher of the True American of Trenton, New Jersey 1801 – 1824 ; clerk in the New Jersey General Assembly in 1804 ; judge advocate and captain, Hunterdon Brigade, New Jersey Militia, in 1806 ; surrogate of Hunterdon County, New Jersey in 1808 ; member of the General Assembly 1809 – 1811 ; brigadier general and Adjutant General of New Jersey from 1810 – 1812, and reappointed in 1814 ; captain in the Third Regiment, Hunterdon Brigade 1814 ; captain in the New Jersey Militia 1814 ; brigadier general and Quartermaster General of New Jersey from 1821 to 1824.

* 1806 – John A. Roebling, German-American engineer, designed the Brooklyn Bridge ( d. 1869 )

It was rebuilt in 1806 by the Cohoes Bridge Company and tolls increased.

In 1806 a scheme was proposed by Ralph Dodd to open the south bank of the Thames for development, by building a new major road from Hyde Park Corner to Kennington and Greenwich, crossing the river upstream of the existing Westminster Bridge.

Also at this site is Tongland Bridge, built in 1806 by Thomas Telford.

It is at least thirty years older than the Clifton Suspension Bridge and was described in 1806 as " a beerhouse with cottage adjoining ".

* John A. Roebling ( 1806 – 1869 ), civil engineer and designer of the Brooklyn Bridge.

* Horatio Bridge ( 1806 – 1893 ), American naval commodore

Commodore Horatio Bridge ( 1806 — March 1893 ) was an officer of the United States Navy who, as Chief of the Bureau of Provisions, served for many years as head of the Navy's supply organization.

A charter to build the road between Rolfe's Lane ( Ocean Avenue ) and the island was granted in 1806 to the Plum Island Turnpike and Bridge Corporation.

To its north is the New Bridge, designed by John Rennie the Elder and built in 1806.

* John ( Johann ) August Roebling ( 1806 – 1869 ), civil engineer famous for the design of the Brooklyn Bridge.

The Dee is crossed shortly downriver by Tongland Bridge, a stone arch bridge constructed in 1806 by Thomas Telford.

* 1806 Considerations on the Expediency of a Bridge from one Part of Boston to another.