Some unknown Hungarian mistress of his.
Lily Langtry
Bessie Blount who was better known by her nickname of "Bessie", was a mistress of Henry VIII of England.
She was Benito Mussolini's most well known mistress.
england
A great mystery the bold have been known to journey into
Marvell's To his coy mistress
Mary was known as "Mistress Mary, quite contrary" among the English in The Secret Garden.
"To His Coy Mistress" was written by the metaphysical poet Andrew Marvell in the 17th century. The poem is known for its exploration of love, time, and mortality, as well as its persuasive arguments to convince the speaker's mistress to seize the moment.
Mystery
Despoina was a fertility goddess who was worshiped alongside her mother Demeter in an mystery-cult. Her father was Poseidon. Despoina is the title "Mistress", this goddesses name is otherwise lost.
Yes it is, girlfriend, lover, the other woman, and the home wrecker.