The Hohenzollerns were a European royal family that ruled the Dutchy of Prussia (1525 - 1701), the Kingdom of Prussia (1701 - 1918) and they ruled the German Empire (1871 - 1918). However, they were dethroned following World War I. | The Hohenzollerns were a European royal family that ruled the Dutchy of Prussia (1525 - 1701), the Kingdom of Prussia (1701 - 1918) and they ruled the German Empire (1871 - 1918). However, they were dethroned following World War I. |