Euphrosyne (Euphrosina) Löf (1772–1828) was a Swedish ballet dancer and stage actress, best known for her affair with Prince Frederick Adolf of Sweden from 1797 to 1801, after his relationship with Sophie Hagman - Euphrosyne acted as his hostess at Tullgarn.
She was the sister of the actress Fredrique Löwen and their parents worked in the royal court, where their father worked as taffeltäckare. Euphrosyne made a successful stage debut on the Royal Dramatic Theatre in 1791, and she also took part in ballets at the Opera. She was among the first Swedish actresses known by name to have performed in breeches role; in 1794, she and Inga Åberg did the two male leading parts of August and Theodor in the play De begge kammarpagerna (The Two Valets) by Kexel. For comparison, the first confirmed time a Swedish male actor played a female part was Kjell Waltman as Mother Bobi in 1781, though the all-male student troupe of 1686–1691 must have performed female parts as well. She appeared in Gustav III's plays, in Iphigenie by Gluck, as Märta Banér and as Ebba Brahe in Gustav Adolf och Ebba Brahe (1794) by Gustav III. She became the lover of prince Frederick Adolf after his relationship with Sophie Hagman ended. She was not liked and described as nasty [1], a "harlot who sold herself to anyone", who showed no gratitude toward all the gifts she was given and who is said to infected Frederick with venereal desieces[2] and the relationship was criticized within the court who considered Löf "unworthy"[3]
In 1801, Frederick ended the relationship because of her reportedly "bad behavior" and the opposition against it and granted her a pension until she entered into a new official relationship[4]