"Prince Friedrich Karl of Prussia (20 March 1828 – 15 June 1885) was the son of Prince Charles of Prussia (1801–1883) and his wife, Princess Marie of Saxe-Weimar-Eisenach (1808–1877). Prince Friedrich Karl was a grandson of King Frederick William III of Prussia and a nephew of Frederick William IV and William I. He was born at Schloss Klein in Berlin.
As a military commander, the Prince had a major influence on the Royal Prussian Army´s advances in training and tactics in the 1850s and 1860s. He defeated the Austrian army at the Battle of Königgrätz in 1866 and the French Army of the Rhine at the Battle of Mars-la-Tour, overseeing the extinction of the Army of the Rhine at the Siege of Metz in 1870." - (en.wikipedia.org 08.11.2019)
