On 29 November 1879 at the Basilica of Atocha in Madrid, Alfonso married a much more distant relative, Maria Christina of Austria, daughter of Archduke Karl Ferdinand of Austria and of his wife Archduchess Elisabeth of Austria.

* 1918 – Karl Ferdinand Braun, German physicist, Nobel Prize laureate ( b. 1850 )

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.

In 1874 German scientist Karl Ferdinand Braun discovered the " unilateral conduction " of crystals.

In 1897, Karl Ferdinand Braun introduced the cathode ray tube as part of an oscilloscope, a crucial enabling technology for electronic television.

Albert ( full name: Frederick Augustus Albert Anton Ferdinand Joseph Karl Maria Baptist Nepomuk Wilhelm Xaver Georg Fidelis ) ( Dresden, 23 April 1828 – Schloss Sibyllenort ( Szczodre ), 19 June 1902 ) was a King of Saxony and a member of the House of Wettin.

Karl Ferdinand Braun ( 6 June 1850 – 20 April 1918 ) was a German inventor, physicist and Nobel laureate in physics.

* In the anime adaptation of the 2009 Japanese visual novel, Steins ; Gate, the character Yūgo Tennōji, aka ' Mr. Braun ', uses the pseudonym ' FB ', after Karl Ferdinand Braun.

* Naughton, Russell, " Karl Ferdinand Braun, Dr: 1850-1918 ".

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* 1873 – Austrian explorers Julius von Payer and Karl Weyprecht discover the archipelago of Franz Joseph Land in the Arctic Sea.

* 1734 – Karl von Ordóñez, Austrian composer ( d. 1786 )

His circle included the musicians Alexander von Zemlinsky and Franz Schreker, the painter Gustav Klimt, the writer and satirist Karl Kraus, the architect Adolf Loos, and the poet Peter Altenberg.

* Karl Heinrich von Weizsäcker, Das apostolische Zeitalter ( 1886 )

* 1885 – Karl Theodor Ernst von Siebold, German physiologist ( b. 1804 )

Archduke Charles of Austria, Duke of Teschen (, also known as Karl von Österreich-Teschen ) ( Full name: Karl Ludwig Johann Josef Lorenz of Austria ) ( 5 September 1771 – 30 April 1847 ) was an Austrian field-marshal, the third son of emperor Leopold II and his wife Infanta Maria Luisa of Spain.

Nonetheless Charles is a member of a pantheon of famous Napoleonic figures that includes the Emperor himself, Louis Nicolas Davout, Andre Massena, Karl von Schwarzenberg, Mikhail Kutuzov, Gebhard Leberecht von Blücher and the aforementioned Duke of Wellington.

The dandy horse, also called Draisienne or laufmaschine, was the first human means of transport to use only two wheels in tandem and was invented by the German Baron Karl von Drais.

Clausewitz, Hermann von Boyen ( 1771 – 1848 ) and Karl von Grolman ( 1777 – 1843 ) were Scharnhorst's primary allies in his efforts to reform the Prussian army between 1807 and 1814.

Teil: Karl Kadletz ( unter Mitarbeit von Peter Schuster und Ildikó Cazan-Simányi ) Quellenanhang.

* Friedrich Karl von Savigny

* 1812 – Karl Eduard Zachariae von Lingenthal, German jurist ( d. 1894 )

The earliest known existing concertos are by Karl Ditters von Dittersdorf, who composed two concertos for the double bass and a Sinfonia Concertante for viola and double bass.

* 1918 – Friedrich Karl von Hessen, a German prince elected by the Parliament of Finland to become King Väinö I, renounces the Finnish throne.

The German Karl Adolph von Basedow also independently reported the same constellation of symptoms in 1840, while earlier reports of the disease were also published by the Italians Giuseppe Flajani and Antonio Giuseppe Testa, in 1802 and 1810 respectively, and by the English physician Caleb Hillier Parry ( a friend of Edward Jenner ) in the late 18th century.

Although many naturalists have studied aspects of animal behaviour throughout history, the modern discipline of ethology is generally considered to have begun during the 1930s with the work of Dutch biologist Nikolaas Tinbergen and Austrian biologists Konrad Lorenz and Karl von Frisch, joint winners of the 1973 Nobel Prize in Physiology or Medicine.

The most sophisticated investigation of this kind was the study by Karl von Frisch of the so-called " dance language " related to bee communication.

His concept of recapitulation has been refuted in the form he gave it ( now called " strong recapitulation "), in favour of the ideas first advanced by Karl Ernst von Baer.

( One of the founders of the CS was a hero of Dollfuss ', Karl Freiherr von Vogelsang.

Philosophers associated with empiricism include Aristotle, Alhazen, Avicenna, Ibn Tufail, Robert Grosseteste, William of Ockham, Francis Bacon, Thomas Hobbes, Robert Boyle, John Locke, George Berkeley, David Hume, Leopold von Ranke, John Stuart Mill, and Karl Popper.

Critics in the late 19th and early 20th centuries, Karl von Baer and Wilhelm His, did not believe that living embryos reproduce the evolutionary process and produced embryo drawings of their own which emphasized the differences in early embryological development.

Ernst Haeckel, along with Karl von Baer and Wilhelm His, are primarily influential in forming the preliminary foundations of ‘ phylogenetic embryology ’ based on principles of evolution.