* Herbert Austin ( 1866 – 1941 ), British founder of the Austin Motor Company

* 1866 – The Grand Army of the Republic, an American patriotic organization composed of Union veterans of the American Civil War, is founded.

* 1866 – Felix-Raymond-Marie Rouleau, Canadian cardinal of the Roman Catholic Church ( d. 1931 )

* 1866 – Princess Viktoria of Prussia ( d. 1929 )

* 1866 – Allen Lard, American golfer ( death date unknown )

* 1866 – Giovanni Agnelli, Italian businessman, founded Fiat S. p. A ( d. 1945 )

* 1866 – Gábor Klauzál, Hungarian politician ( b. 1804 )

* 1866 – Matthew Henson, American explorer ( d. 1955 )

* 1866 – José de Diego, Puerto Rican statesman and journalist ( d. 1918 )

* 1866 – Charles Jean de la Vallée-Poussin, Belgian mathematician ( d. 1962 )

* 1866 – Italo Santelli, Italian fencer ( d. 1945 )

* 1866 – Jacinto Benavente, Spanish writer, Nobel Prize laureate ( d. 1954 )

* 1866 – Henrik Sillem, Dutch sports shooter ( d. 1907 )

* Alexander John Cuza, prince of Romania ( 1859 – 1866 )

* 1866 – Anne Sullivan, American teacher, instructor and companion of Helen Keller ( d. 1936 )

* 1866 – Ernest Starling, British physiologist ( d. 1927 )

* 1866 – Italy and Prussia ally against the Austrian Empire.

* 1866 – The American Society for the Prevention of Cruelty to Animals ( ASPCA ) is founded in New York City by Henry Bergh.

He married fourthly at the Dolmabahçe Palace, Constantinople, on 21 September 1866 to Georgian HH Hayranidil Kadın Efendi ( Kars, 2 November 1846 – Ortaköy Palace, Constantinople, 26 November 1898 ), and had two children.

The Earl of Derby, Prime Minister 1852, 1858 – 59, 1866 – 68

Charles Erdman ( 1866 – 1960 ) advocated apostolic authorship and wrote that only the Apostle John fits the image of the author derived from the text.

#** Marie Laetitia Eugénie Catherine Adélaïde Bonaparte ( 1866 – 1926 )

Le déjeuner sur l ' herbe, ( right section ), with Gustave Courbet, 1865 – 1866, Musée d ' Orsay, Paris, France | Paris

Three wars led to military successes and helped to convince German people to do this: the Second war of Schleswig against Denmark in 1864, the Austro-Prussian War against Austria in 1866, and the Franco-Prussian War against the Second French Empire in 1870 – 71.

When the Austro-Prussian War broke out in 1866, Albert then Crown Prince ( German: Kronprinz ), took up the command of the Saxon forces opposing the Prussian Army of Prince Frederick Charles of Prussia.

Three wars led to military successes and helped to persuade German people to do this: the Second war of Schleswig against Denmark in 1864, the Austro-Prussian War in 1866, and the Franco-Prussian War against France in 1870 – 71.

The German Confederation ended as a result of the Austro-Prussian War of 1866 between the constituent Confederation entities of the Austrian Empire and its allies on one side and the Kingdom of Prussia and its allies on the other.

As a consequence, Hanover passed to William IV's brother, Ernest Augustus, and remained a kingdom until 1866, when it was annexed by Prussia during the Austro-Prussian war.

* 1866 – Austro-Prussian War: Battle of Lissa – The Austrian Navy

* 1866 – Battle of Custoza: an Austrian army defeats the Italian army during the Austro-Prussian War.

* 1866 – Austro-Prussian War is decided at the Battle of Königgratz, resulting in Prussia taking over as the prominent German nation from Austria.

In 1866, the Austro-Prussian war resulted in the dissolution of the Germanic Confederation and Luxembourg was declared neutral in perpetuity.

In 1866 the Duchy and with it Limburg passed to Prussia in the wake of the Austro-Prussian War.

This road, both north and south of the platz, was named Königgrätzer Straße after the Prussian victory over Austria at the Battle of Königgrätz on 3 July 1866, in the Austro-Prussian War.

In 1866 Venetia was ceded by France, who had obtained it from Austria at the end of the Austro-Prussian War, to the new Kingdom of Italy, which had been created in 1861 under the Savoy monarchy.

Austria then entered the nineteenth century as part of the German Confederation until the Austro-Prussian War of 1866 excluded her, and Austria then continued as the Austro-Hungarian Empire ( 1867 – 1918 ).

Following the Congress of Vienna in 1815 Austria, which had emerged as the Austrian Empire became part of the German Confederation till the Austro-Prussian war of 1866, and then the Austro-Hungarian Empire which collapsed at the end of World War I. Austria was briefly independent ( First Republic ) till annexation by the German Third Reich, partitioned after the Second World War and then became the independent sovereign state ( Second Republic ) that has existed to the present day.

Having sided with Austria in the Austro-Prussian War for supremacy in Germany, the principality was annexed by Prussia in 1866.

In the Austro-Prussian War of 1866, Nassau took Austria's side.

After the Austro-Prussian War of 1866, victorious Prussia took control over all Schleswig and Holstein but was obliged by the Peace of Prague to hold a referendum in predominantly Danish-speaking Northern Schleswig, which it never did.

However, tensions between the two powers culminated in the Austro-Prussian War of 1866.

Although Franz Joseph ceded no territory to the Kingdom of Prussia after the Austrian defeat in the Austro-Prussian War, the Peace of Prague ( 23 August 1866 ) settled the German question in favor of Prussia, which prevented the unification of Germany under the House of Habsburg ( Großdeutsche Lösung ).

The Standard gained eminence for its detailed foreign news, with its reporting events of the American Civil War ( 1861 – 1865 ), of the Austro-Prussian War of 1866, and of the Franco-Prussian War of 1870, all contributing to a rise in circulation.

In the Austro-Prussian War of 1866, Austria contested with Prussia the position of leadership among the German states.

France saw its dominance on the continent of Europe eroded by Prussia's crushing victory over Austria in the Austro-Prussian War in June – August 1866.

After the Austro-Prussian War in 1866, the Prussian-dominated North German Confederation adopted a tricolour of black-white-red as its flag.

In 1866 Osnabrück was annexed by Prussia after the Austro-Prussian War and administered within the Province of Hanover.