What year was the end of XXX?
Grand Duchy of Hesse
The Grand Duchy of Hesse and by Rhine (German: Großherzogtum Hessen und bei Rhein), or the Grand Duchy of Hesse (German: Großherzogtum Hessen) between 1806 and 1816, was an independent country and member state of the German Confederation as of 1806, when the Landgraviate of Hesse-Darmstadt was elevated to a Grand Duchy which it remained until 1918, when the monarchy was overthrown.
1918