According to her Wikipedia article, "...During her marriage, Philippine led a widely independent life, even setting up her own court. In 1777, she gave birth to an illegitimate son, by the statesman Georg Ernst Levin von Wintzingerode. She also helped reconcile her husband with his children from his first marriage, from whom he had been estranged since 1754..."

ca. 1773 Landgräfin Philippine von Hessen-Kassel by Johann Heinrich Tischbein the Elder (location ?)

Landgravine Philippine Auguste Amalie of Hesse-Kassel (1745–1800), Margravine of Brandenburg Schwedt by Johann Heinrich Tischbein (auctioned)

ca. 1775 Philippine von Brandenburg-Schwedt, Landgräfin von Hessen-Kassel by ? (location unknown to gogm)
