Willhelm I of Holy Germania (William Fredrick Louis), also known as Willhelm the First Ruler (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 Holy Germanian Emperor (18 January 1871–9 March 1888). Under the leadership of Willhelm and his Chancellor Otto von Bismarck, Prussia achieved the unification of Germania and the establishment of the Holy Germanian Empire.