Catharina Oostfries

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Catharina Oostfries, or Trijntje Sieuwerts (1636–1708) was a Dutch Golden Age glass painter.


Oostfries was born in Nieuwkoop. According to Houbraken she kept up her drawing and glass painting into her seventies.[1]

According to the RKD she was the daughter of Siewert Oostvries, and was also known as Trijntje Siewerts.[2] She was trained by her older brother Jozef Oostfries, a respected glass painter in Hoorn.[2] She married the glass painter Claes Pietersz van der Meulen, and their son Sieuwert van der Meulen also became a painter.[2] Her sister Heiltje married the painter Jan Slob, who had been a pupil of her brother.[3][4] She died in Alkmaar.


  1. ^ (Dutch) Catharina Oostfries Biography in De groote schouburgh der Nederlantsche konstschilders en schilderessen (1718) by Arnold Houbraken, courtesy of the Digital library for Dutch literature
  2. ^ a b c Catharina Oostfries in the RKD
  3. ^ Heiltje Sieuwerts on genealogie online
  4. ^ Jan Slob Biography in De groote schouburgh