^"Institoris" is the Latin genitive case of "Institor" ("retailer"). It was a common practice in those times to take the إضافة (لغة) of the father's name for latinization, but this genitive was used as nominative in Latin texts ("Venerabilis & religiosus frater Henricus institoris"). In German texts this name was abridged to "Institor," according to the custom of omitting Latin endings in translations (cf. "Iuvenalis" – "Juvenal").
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