Melchior von Diepenbrock (born 1798), German Catholic Prince-Bishop of Breslau and Cardinal
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Alphons Diepenbrock (1862–1921), Dutch composer, essayist and classicist
There Vermeulen revealed himself as an advocate of the music of Claude Debussy, Gustav Mahler and Diepenbrock, whom he later used to call his "maître spirituel".
Melchior, Freiherr von Diepenbrock (b. 6 January 1798, at Bocholt in Westphalia; d. at the castle of Johannesberg in Jauernig, 20 January 1853) was a German Catholic Prince-Bishop of Breslau and Cardinal.