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Registered City Officials
The registered city officials (geadmitteerde functionarissen).
They had to be appointed or designated by the City, usually the mayors, but they were not paid by the city. Prominent examples are notaries and lawyers, but this group also included mourners at funerals.
This category also includes Leeuwenhoek in his role as city wine gauger (wijnroeier). He was appointed by the City and was supposed to stay neutral and objective in his measurements, as well as stay out of the wine trade. However, he was paid by the tax collectors and the payments are recorded in notary documents, not in the city treasurer's account books.
The positions often involved trust, so the individuals took an oath (eed), a different one for each office.