Cause and Effect, my love.—Persephone, The Matrix Reloaded
Persephone was the wife of the Merovingian.
Persephone had been the neglected wife of the Merovingian, who sought temporal company from beautiful patrons of Le Vrai restaurant.
When Neo, Morpheus and Trinity came to the restaurant for the Keymaker and were ousted by Merovingian; Persophone, angry with her husband, offered them her help, in exchange of a passionate kiss from Neo. Persephone tells Neo and Trinity of the time that she and her husband arrived in the Matrix, commenting that the Merovingian was much like Neo at one time.
Soon after, Niobe met her in the TV room, who was looking for Morpheus.
In the theatrical releases she is portrayed by actress Monica Bellucci.
The name Persephone is a reference to Greek mythology, in which Hades, the god of the underworld, kidnapped and married a young maiden named Persephone, who always remained resentful of him and unhappy with her marriage. Similarly, The Matrix's Persephone is constantly working against her husband and trying to undermine his endeavors, even though there is never a mention of the possibility of their separation.