"Gilles Demarteau or Gilles Demarteau the Elder (19 January 1722, in Liège – 31 July 1776, in Paris) was an etcher, engraver and publisher who was active in Paris for his entire career. He is one of the persons to whom has been attributed the invention of the crayon manner of engraving. He is recognized as playing an important role in the development of this engraving technique. He was one of the key reproductive engravers and publishers of the work of François Boucher." - (en.wikipedia.org 23.11.2019)
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