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Koch, A. C. F., Dr. Oorkondenboek van Holland en Zeeland tot 1299. Huygens Insti...
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Koch, A. C. F., Dr. Oorkondenboek van Holland en Zeeland tot 1299. Huygens Institute. 's-Gravenhage: Martinus Nihoff (1970), V. 1291 tot 1299, Oorkonde van Holland en Zeeland, citing, “1189 [probablyApril], Merheim Diederik, archdeacon of the diocese of Liège, declares that Rutger van Merheim...with the cooperation of Count Floris III of Holland has donated to the abbey van Kamp…This donation toKamp Abbey dates from...when Rutger van Merheim accepted the crusade. Presumably Count Floris III also moved south at that time and was able to cooperate in the donation from Rutger.” 1189 AD; Oorkonde No. 219, p. 375.