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Johann Wilhalm appointed Werff court painter in 1697 at the annual salary of 4.000 guilders with the understanding that the artist would spend six months of the year at his court in Düsseldorf. The elector remained van der Werff's Maecenas until his death in 1716. In 1703 the elector created van der Werff a knight.
Werff was commissioned to paint the portrait of the elector as well as that of his wife, Maria Anna Loisia de'Medici.
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