Title: Proserpina
Content:  Proserpina or Proserpine  is an ancient Roman goddess whose cult, myths and mysteries were combined from those of Libera, an early Roman goddess of wine. In Greek she is known as Persephone and her mother is Demeter, goddesses of grain and agriculture. The originally Roman goddess Libera was daughter of the agricultural goddess Ceres and wife to Liber, god of wine and freedom. In 204, a new "Greek-style" cult to Ceres and Proserpina as "Mother and Maiden" was imported from southern Italy, along with Greek priestesses to serve it, and was installed in Libera and Ceres' temple on Rome's Aventine Hill. The 
Title: Proserpina
Content:  cult and its priesthood were actively promoted by Rome's religious authorities as morally desirable for respectable Roman women, and may have partly subsumed the temple's older, native cult to Ceres, Liber and Libera; but the new rites seem to have functioned alongside the old, rather than replaced them. Just as Persephone was thought to be a daughter of Demeter, Romans made Proserpina a daughter of Demeter's Roman equivalent, Ceres. Like Persephone, Proserpina is associated with the underworld realm and its ruler; and along with her mother Ceres, with the springtime growth of crops and the cycle of life, death and rebirth 
Title: Proserpina
Content:  renewal. Her name is a Latinisation of "Persephone", perhaps influenced by the Latin proserpere ("to emerge, to creep forth"), with reference to the growing of grain. Her core myths – her forcible abduction by the god of the underworld, her mother's search for her and her eventual but temporary restoration to the world above – are the subject of works in Roman and later art and literature. In particular, Proserpina's seizure by the god of the Underworld – usually described as the Rape of Proserpina, or of Persephone – has offered dramatic subject matter for Renaissance and later sculptors and painters.
Title: Proserpina
Content:  Proserpina was officially introduced to Rome around 205, along with the ritus graecia cereris (a Greek form of cult dedicated to her mother Ceres), as part of Rome's general religious recruitment of deities as allies against Carthage, towards the end of the Second Punic War. The cult originated in southern Italy (part of Magna Graecia) and was probably based on the women-only Greek Thesmophoria, a mystery cult to Demeter and Persephone as "Mother and Maiden". It arrived along with its Greek priestesses, who were granted Roman citizenship so that they could pray to the gods "with a foreign and external knowledge, but with a domestic and civil intention". The 
Title: Proserpina
Content:  abductor and later consort by the Roman god of the underworld's traditional Latin name, Dis. Venus, in order to bring love to Pluto, sent her son Amor (also known as Cupid) to hit Pluto with one of his arrows. Proserpina was in Sicily, at the Pergusa Lake near Enna, where she was playing with some nymphs and collecting flowers, when Pluto came out from the volcano Etna with four black horses named Orphnaeus, Aethon, Nycteus and Alastor. He abducted her in order to marry her and live with her in the underworld of which he was the ruler. Her 
Title: Proserpina
Content:  The most extensive myth of Proserpina in Latin is Claudian's (4th century ). It is closely connected with that of Orpheus and Eurydice. In Virgil's Georgics, Orpheus' beloved wife, Eurydice, died from a snake-bite; Proserpina allowed Orpheus into Hades without losing his life; charmed by his music, she allowed him to lead his wife back to the land of the living, as long as he did not look back during the journey. But Orpheus could not resist a backward glance, so Eurydice was forever lost to him.
Title: Persephone
Content:   The Romans first heard of her from the Aeolian and Dorian cities of Magna Graecia, who used the dialectal variant Proserpinē (Προσερπίνη). Hence, in Roman mythology she was called Proserpina, a name erroneously derived by the Romans from proserpere, "to shoot forth" and as such became an emblematic figure of the Renaissance. In 205, Rome officially identified Proserpina with the local Italic goddess Libera, who, along with Liber, were closely associated with the Roman grain goddess Ceres (considered equivalent to the Greek Demeter). The Roman author Gaius Julius Hyginus also considered Proserpina equivalent to the Cretan goddess Ariadne, who was the bride of Liber's Greek equivalent, Dionysus.
Title: Proserpina
Content:  "... Diti patri dedicata est, qui dives ut apud Graecos Plouton, quia et recidunt omnia in terras et oriuntur e terris, Cui Proserpinam (quod Graecorum nomen est, ea enim est quae Persefone Graece nominatur) — quam frugum semen esse volunt absconditamque quaeri a matre fingunt." - Marcus Tullius Cicero, De natura deorum II, 66 
Title: Procne
Content:  Procne's mother was the naiad Zeuxippe and her siblings were Philomela, Erechtheus, Butes and possibly Teuthras. She married King Tereus of Thrace and became the mother of Itys (Itylos).
Title: Proserpin (Kraus)
Content:  The opera is set in Sicily. There, young mortal Atis has fallen in love with the goddess Proserpin, daughter of Jupiter and the fertility goddess Ceres, and for her finally abandons his fiancée Cyane. Pluto, god of the underworld, hears her fury, is also in love with Proserpin and abducts her to his realm after locating her with the help of Cyane. In Sicily, everyone is searching in vain for Proserpin. Ceres appears in a deep sorrow when she discovers what has happened, and fails to start the summer. Atis's grief at her loss is such that he jumps into Mount Etna to end his life. 

Question: Who is the mother of Proserpina?
Answer: Ceres.