TheGrand Duchy of Hesse (German:Großherzogtum Hessen) was a former state that existed in modern-dayGermany. It was formed in 1806 after the dissolution of theHoly Roman Empire as a result of the actions ofNapoleon, who then elevated the formerLandgraviate of Hesse-Darmstadt to the level ofgrand duchy. For this reason, this state was occasionally known simply asHesse-Darmstadt.