As mentioned below, it is true that this person never existed. This fictional character is most often used to justify the fabricated connections between the Rapalje family and the Coligny family that never existed. Read the article linked in the comment below for more detail as well as the information posted in the Jerome Holgate Fabrication category.
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R > Rapalje | D > de Rapalje > Willem Janssen (Rapalje) de Rapalje
Categories: Jerome Holgate Fabrication | Disproven Existence