It is formed out of the former lordships of Dachstuhl and Oberstein, of part of the ancient countship of Sponheim, and sections of the duchy of Jiilich, which were granted to the grand-duke of Oldenburg by the congress of Vienna in 1815.

OBERSTEIN, a town of Germany, in the principality of Birkenfeld, belonging to the grand duchy of Oldenburg, on the river Nahe, 33m.

See Hisserich, Die Idar-Obersteiner Industrie (Oberstein, 1894).