About the day » Thursday April 12, 1866Calender converter

• Adriaan Vermeiren, Baarle-Nassau († 1947)
• Van Der Kwast, Jaarsveld, Lopik, Utrecht, Nederland († 1866)
• Abraham van Messel, Harlingen, Friesland, Nederland († 1931)
• Adriaan Vermeiren, Baarle Nassau Belgie († 1947)
• Aleksandr Ilyich Ulyanov († 1887)
• Anna Catsman, Nieuw-en Sint Joosland, ZL.NL († 1945)
• Duivenvoorden, Heemstede, Noord-Holland, Nederland
• Adriana Andel, van, Rotterdam, Nederland († 1949)
• Knobel, Etten-Leur, Noord-Brabant, Nederland († 1866)
• Alida Hooijschuur, Zaandam († 1942)

• Anna Cathgarina Johannes de Haas (65), Finsterwolde, Groningen, Netherlands
• ANTJE CORNELIS KOLLIS (74), Hoorn
• Andries Joseph van Reij (65), Vaals
• Aleida Lempersz (0), Enschede, Enschede, Overijssel, Netherlands
• Adrianus Jacobus van der Pluijm (19), Rotterdam, Rotterdam, Zuid-Holland, Nederland
• Alijda van Arnhem (58), Zeddam
• Aleida (Alijda) van Arnhem (58), Zeddam, Gelderland, Nederland
• anna christina ramaekers (84), opitter
• Rosegaarde (66), Hummelo/Drempt
• Anneke Laanstra (4), Buitenpost, gem. Achtkarspelen, Friesland, Nederland

• 1851 » Edward Walter Maunder, English astronomer and author († 1928)
• 1851 » José Gautier Benítez, Puerto Rican soldier and poet († 1880)
• 1852 » Ferdinand von Lindemann, German mathematician and academic († 1939)
• 1856 » Martin Conway, 1st Baron Conway of Allington, English mountaineer, cartographer, and politician († 1937)
• 1863 » Raul Pompeia, Brazilian writer († 1895)
• 1868 » Akiyama Saneyuki, Japanese admiral († 1918)
• 1869 » Henri Désiré Landru, French serial killer († 1922)
• 1871 » Ioannis Metaxas, Greek general and politician, 130th Prime Minister of Greece († 1941)
• 1874 » William B. Bankhead, American lawyer and politician, 47th Speaker of the United States House of Representatives († 1940)
• 1880 » Addie Joss, American baseball player and journalist († 1911)

• 1850 » Adoniram Judson, American lexicographer and missionary (b. 1788)
• 1866 » Peter Hesketh-Fleetwood, English politician, founded Fleetwood (b. 1801)
• 1872 » Nikolaos Mantzaros, Greek composer and theorist (b. 1795)
• 1878 » William M. Tweed, American lawyer and politician (b. 1823)
• 1879 » Richard Taylor, American general (b. 1826)
• 1885 » William Crowther, Dutch-Australian politician, 14th Premier of Tasmania (b. 1817)
• 1898 » Elzéar-Alexandre Taschereau, Canadian cardinal (b. 1820)
• 1902 » Marie Alfred Cornu, French physicist and academic (b. 1842)
• 1906 » Mahesh Chandra Nyayratna Bhattacharyya, Indian scholar, academic, and philanthropist (b. 1836)
• 1912 » Clara Barton, American nurse and humanitarian, founded the American Red Cross (b. 1821)

• Koning Willem III (Huis van Oranje-Nassau) was from 1849 till 1890 sovereign of the Netherlands (also known as Koninkrijk der Nederlanden)
• In The Netherlands , there was from February 1, 1862 to February 10, 1866 the cabinet Thorbecke II, with Mr. J.R. Thorbecke (liberaal) as prime minister.
• In The Netherlands , there was from February 10, 1866 to June 1, 1866 the cabinet Fransen van de Putte, with I.D. Fransen van de Putte (liberaal) as prime minister.
• From June 1, 1866 till June 4, 1868 the Netherlands had a cabinet Van Zuijlen van Nijevelt - Heemskerk with the prime ministers Mr. J.P.J.A. graaf Van Zuijlen van Nijevelt (AR) and Mr. J. Heemskerk Azn. (conservatief).
• The Netherlands had about 3.6 million citizens.
• January 12 » The Royal Aeronautical Society is formed in London.
• April 6 » The Grand Army of the Republic, an American patriotic organization composed of Union veterans of the American Civil War, is founded. It lasts until 1956.
• May 16 » The United States Congress establishes the nickel.
• June 7 » One thousand eight hundred Fenian raiders are repelled back to the United States after looting and plundering the Saint-Armand and Frelighsburg areas of Canada East.
• August 17 » The Grand Duchy of Baden announces her withdrawal from the German Confederation and signs a treaty of peace and alliance with Prussia.
• December 12 » Oaks explosion: The worst mining disaster in England kills 361 miners and rescuers.

The temperature on April 12, 1866 was about 11.1 °C. There was 3 mm of rain. The air pressure was 30 kgf/m² and came mainly from the west-southwest. The airpressure was 76 cm mercury. The atmospheric humidity was 78%.