Frederick William III ruled Prussia during the difficult times of the Napoleonic Wars. The king reluctantly joined the coalition against Napoleon in the Befreiungskriege. Following Napoleon's defeat, he took part in the Congress of Vienna, which assembled to settle the political questions arising from the new, post-Napoleonic order in Europe. His primary interests were internal – the reform of Prussia's Protestant churches.https://en.wikipedia.org/wiki/Frederick_William_III_of_Prussia
Frederick William III ruled Prussia during the difficult times of the Napoleonic Wars. The king reluctantly joined the coalition against Napoleon in the Befreiungskriege. Following Napoleon's defeat, he took part in the Congress of Vienna, which assembled to settle the political questions arising from the new, post-Napoleonic order in Europe. His primary interests were internal – the reform of Prussia's Protestant churches.
Frederick William III, (born August 3, 1770, Potsdam, Prussia [Germany]—died June 7, 1840, Berlin), king of Prussia from 1797, the son of Frederick William II. Neglected by his father, he never mastered his resultant inferiority complex, but the influence of his wife, Louisa of Mecklenburg-Strelitz, whom he married in 1793, occasionally moved him outside his essentially pedestrian character.
Frederick III, also called (until 1888) Crown Prince Frederick William, German Kronprinz Friedrich Wilhelm, in full Friedrich Wilhelm Nikolaus Karl, (born Oct. 18, 1831, Potsdam, Prussia—died June 15, 1888, Potsdam), king of Prussia and German emperor for 99 days in 1888, during which time he was a voiceless invalid, dying of throat cancer.
Frederick William III (1770-1840) was king of Prussia from 1797 to 1840. A weak monarch, he presided first over the near-liquidation of the Prussian state in the Napoleonic Wars and then over its reconstruction. Born in Potsdam on Aug. 3, 1770, Frederick William III succeeded his father, Frederick William II, as king of Prussia in 1797.
Frederick William III ( German: Friedrich Wilhelm III.) (3 August 1770 – 7 June 1840) was king of Prussia from 1797 to 1840. Life[ change | change source] Frederick William was born in Potsdam in 1770 as the son of Friedrich Wilhelm II of Prussia and Frederika Louisa of Hesse-Darmstadt. He was considered to be a shy and reserved boy, 
Frederick William was born in the New Palace at Potsdam in Prussia on 18 October 1831. He was a scion of the House of Hohenzollern , rulers of Prussia, then the most powerful of the German states. Frederick's father, Prince William , was the second son of King Frederick William III and, having been raised in the military traditions of the Hohenzollerns, developed into a strict disciplinarian.
Frederick William I, German Friedrich Wilhelm I, (born August 14, 1688, Berlin—died May 31, 1740, Potsdam, Prussia), second Prussian king, who transformed his country from a second-rate power into the efficient and prosperous state that his son and successor, Frederick II the Great, made a major military power on the Continent.
frederick william iii (german: friedrich wilhelm iii) (3 august 1770 – 7 june 1840) was king of prussia from 1797 to 1840 - friedrich wilhelm iii of prussia stock illustrations Prince Albert Wilhelm Henry of Prussia, August 14, 1862 - April 20 was son of Crown Prince Friedrich Wilhelm and later German Emperor Friedrich III....
found: Wikipedia, May 26, 2020 (Frederick William, Elector of Brandenburg; Frederick William (German: Friedrich Wilhelm) born 16 February 1620 in Stadtschloss, Berlin, Brandenburg-Prussia; died 29 April 1688 in Stadtschloss, Potsdam, Brandenburg-Prussia; Elector of Brandenburg and Duke of Prussia, thus ruler of Brandenburg-Prussia, from 1640 until his death in 1688; a member of the House of ...
Frederick William III of Prussia, Alexander I of Russia and Francis I of Austria after the Battle of Leipzig, 1813. But when Prussia, after it turned against the French Empire, was defeated in the Battle of Jena–Auerstedt (October 14, 1806), Frederick William III was forced to temporarily flee to remote Memel.