He added the small Protestant church Evangelisch-lutherische Schlosskirche to the Iburg castle, thus the complex of castle and monastery has had two churches, Protestant and Catholic, since the 17th century.
Ta lisas väikese protestantliku kiriku Evangelisch-lutherische Schlosskirche Iburgi lossile, seega oli lossi ja kloostri kompleksil 17. sajandist 2 kirikut, protestantlik ja katoliiklik.