In 1611, he purchased the Nassau share of the district of Wehrheim, which Nassau shared with Trier, from his brother John VII.
By German Mediatisation, the county Dietz and its dependencies, and the Lordships Wehrheim and Burbach, all came under the sovereignty of the Duke of Nassau-Usingen and the Prince of Nassau-Weilburg.
The Saalburg, located just off the main road roughly halfway between Bad Homburg and Wehrheim is the most completely reconstructed Roman fort in Germany.
Wehrheim |