Landeshauptarchiv Koblenz

The regional archives for the Land of Rhineland-Pfalz, Germany, based in Koblenz: acronym LHAKo, and, with associated archives Landesarchiv Speyer and Landesarchivverwaltung Rheinland-Pfalz the largest archive in the Land.

More information on the Wikipedia page.

The website, in German, is