According to Houbraken he was the son of Jan Verkolje and the only one of 5 children to carry on his art. Houbraken intended to write a biographical sketch of Nicolaas in his birth year of 1673, but never got that far (he died before publication of Volume III, which contains Jan Verkolje's biographical sketch).
According to the RKD both he and his brother Jan II became painters, having learned painting from their father. Nicolaas became the teacher of Jan Matthias Kok, Jan Maurits Quinkhard and Arnout Rentinck.
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