Hesse (Hessen) Nobility

Hesse-Darmstadt was a German noble family.

Darmstadt was the residence (capital) of the ruling landgraves (1567–1806) and of the Grand Dukes of Hesse (1806-1918).

When the Hanau-Lichtenberg line was extinguished in 1736 a portion of its lands were inherited by Louis IX, a grandson of the last Count - Johann Reinhard III. Louis IX ruled his inheritance under the regency of his father until he became of age in 1740. He then ruled his lands in his own right with a residence in the capital of that area, Buchsweiler (Bouxwiller, France). A royal residence was maintained there until 1765 when his wife moved her residence to Darmstadt. Louis IX maintained a residence at Pirmasens. Three years later on the death of his father, Louis IX became the Landgrave of Hesse-Darmstadt. (Note: This is a simplification of the jurisdiction of these lands and the residences of this royal family)

A history in English may be found at the Wikipedia article Landgraviate of Hesse-Darmstadt.

Hessen-Darmstadt/Staats- und Adresskalender 1785

Walther, A.F. Briefwechsel der „Grossen Landgräfin“ Caroline von Hessen. 2 volumes. Wien: Wilhelm Braumüller, 1877. Digital images. Google Books. https://play.google.com/store/books/details?id=vjkBAAAAQAAJ : 2014. (This is the wife of Louis IX)