Landesarchiv Nordrhein-Westfalen Abteilung Rheinland

A department of the State Archive of North Rhine-Westphalia, Germany.

It was founded in 2008 by the combination of the North Rhine-Westphalian State Archives based in Dusseldorf and the Personenstandsarchiv Rheinland.

More information on the German Wikipedia page

The website, in German, is.