"The convoluted relationship between Werefkin and Jawlensky needs clarification, particularly because of its impact on Werefkin's working life. Although Werefkin has often been referred to as Jawlensky's muse or mentor, in actuality their relationship was a good deal more complex than that would imply; in fact, they lived for many years [till 1921, then they separated and Marianne left for Italy] in a ménage a trois [together with Werefkin's domestic servant Yelena Neznakomova, who was pregnant in 1902, with Jawlensky as the father]."
January 1, 1970
https://en.wikiquote.org/wiki/Marianne_von_Werefkin