Girl Slaves of Morgana Le Fay (1971)
Girl Slaves of Morgana Le Fay (French: Morgane et ses Nymphes) is a 1971 film by Bruno Gantillon, an erotic and parodic tale involving Morgan le Fay and a castle full of women in the French countryside. The role of Morgan le Fay is played by Dominique Delpierre; she rules the island Avalon as if it were Lesbos in a lesbian exploitative movie praised by critics for its setup and characters, and named a "neglected Eurotrash classic".
More at Wikipedia.