The girl plays Lucrece Borgia, and her father (the old man) is the pope Alexander VI, the other bearded man must be her brother. This is a real story.The pope Alexandre VI Borja organized an orgy for the wedding of her daughter Lucrece on the 31 october 1501. It was a huge scandal known everywhere in Europe. This certainly helped Martin Luther to found a new evangelic religion in 1517-1521.
https://www.imdb.com/title/tt0071359/