Anna, Duchess of Cleves: The King's 'Beloved Sister', by Heather R. Darsie . Some claim the records were destroyed in the conflict between Protestants and Catholics at the time but regardless because Anna op den Graeff was of lower social rank, Johann Wilhelm's titles and privileges were not passed on to their son and he was considered officially without an heir
"Van Bebber Pioneers Newsletter", Doc Store. January 1988" A copied text that is not documented by extern sources says: "Made up from genuine document by Pieter de Graeff, Baron van Zuid Polsbrook (Polsbroek), Purmerland and Ilpendam, living 1661, continued by Pieter Gerritsz de Graeff and after that by Dirk de Graeff van Polsbroek (Holland). In the Diploma of Nobility loaned to Andries de Graeff it was affirmed that the family De Graeff was formerly called von Graben, which is the same as de Graeff. This family today shows the same Coat of Arms as the De Graeff family." Accessed 29 sept 2011
Anna, Duchess of Cleves: The King's 'Beloved Sister', by Heather R. Darsie . Some claim the records were destroyed in the conflict between Protestants and Catholics at the time but regardless because Anna op den Graeff was of lower social rank, Johann Wilhelm's titles and privileges were not passed on to their son and he was considered officially without an heir
