​BERCHEM (or Berghem), NICOLAAS (1620–1683), Dutch painter, was born at Haarlem. He received instruction from his father (Pieter Claasz van Haarlem) and from the painters Van Goyen, Jan Wils and Weenix. It is not known why he called himself Berchem (or Berighem, and other variants). His pictures, of which he produced an immense number, were in great demand, as were also his etchings and drawings. His landscapes are highly esteemed; and many of them have been finely engraved by John Visscher. His finest pictures are at the Amsterdam Museum and at the Hermitage, St Petersburg.