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This article should be moved to either Konrad of Wallenrode, or Conrad of Wallenrode. It is common in English to translate the names of nobility, especially when concerning German names. Hence it's William II instead of Wilhelm II and Albert Frederick, Duke of Prussia instead of Herzog Albrecht Friedrich von Preußen.
The preposition "von" can easily be translated with the English "of" as these are (or originally were) titles, not surnames.   
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