In the following year, the Archbishop Werner II von Eppenstein acceded to this outcome in the Treaty of Langsdorf, accepting Henry as his liege-man and Landgrave of Hesse.

At this time, the landgraviate of Hesse consisted of the region between Wolfhagen, Zierenberg, Eschwege, Alsfeld, Grünberg, Frankenberg and Biedenkopf.

On 12 May 1292, Henry was made a Reichsfürst (prince of the realm) by King Adolf of Nassau, freeing Hesse of the supremacy of the Archbishop of Mainz.

By skillful diplomacy he gained the cities of Sooden-Allendorf, Kaufungen, Witzenhausen, Immenhausen, Grebenstein, Wanfried, Staufenberg, Trendelburg and Reinhardswald.

Henry died in Marburg during the conflict, and was buried there in St. Elisabeth's Church, which became the gravesite of the succeeding Landgraves for several more centuries.