High Quality Content by WIKIPEDIA articles! Wilhelm I, also known as Wilhelm the Great (22 March 1797 9 March 1888) of the House of Hohenzollern was the King of Prussia (2 January 1861 9 March 1888) and the first German Emperor (18 January 1871 9 March 1888). Under the leadership of Wilhelm and his Chancellor Otto von Bismarck, Prussia achieved the unification of Germany and the establishment of the German Empire. The future king and emperor was born Frederick Louis of Prussia (Wilhelm Friedrich Ludwig von Preußen) in Berlin. As the second son of King Frederick William III and Louise of Mecklenburg-Strelitz, William was not expected to ascend to the throne and hence received little education.