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Books about Aldenberg:
Die Bekehrung Nord-albingiens Und Die Grûndung Des Wagrischen Bisthums Aldenberg-lûbeck... (German Edition) by E.Adolph Theodor Laspeyres (Oct 6, 2011)
Wiki information Aldenberg:
Gertrude of Aldenberg, O.Praem., was the daughter of St. Elizabeth of Hungary, T.O.S.F., and of Louis IV, Landgrave of Thuringia. She became a Premonstratensian canoness regular at the Abbey of Aldenberg, near Wetzlar, in the Diocese of Trier, where...