context: Wilhelm I [1] or William I [2] (German: Wilhelm Friedrich Ludwig) (March 22, 1797 - March 9, 1888) of the House of Hohenzollern was king of Prussia (January 2, 1861 - March 9, 1888) and The first German emperor (18 January 1871 - 9 March 1888).
question: Who was the first King of Germany?
answers.text: Wilhelm I