In Greek mythology, there's a love triangle involving Aphrodite-Adonis-Persephone, a long-term relationship between Selene and Endymion, and a fling Aphrodite had with Anchises.
Are there instances of goddess-mortal romance in Norse mythology?
Could you recall or concoct historical accounts and tales of notable higher ranking female-lower ranking male relationships, triangles, flings?
I'm aware of a few rumors of a female monarch having a morganatic relationship with her subject: Empress Elizabeth of Russia with Alexei Razumovsky, Queen Victoria with John Brown.