Cupid became more common in Roman art from the time of Augustus, the first Roman emperor. After the Battle of Actium, when Antony and Cleopatra were defeated, Cupid transferring the weapons of Mars to his mother Venus became a motif of Augustan imagery. In the "Aeneid", the national epic of Rome by the poet Virgil, Cupid disguises himself as Iulus, the son of Aeneas who was in turn the son of Venus herself, and in this form he beguiles Queen Dido of Carthage to fall in love with the hero. She gives safe harbor to Aeneas and his band of refugees from Troy, only to be abandoned by him as he fulfills his destiny to found Rome. Iulus (also known as Ascanius) becomes the mythical founder of the Julian family from which Julius Caesar came. Augustus, Caesar's heir, commemorated a beloved great-grandson who died as a child by having him portrayed as Cupid, dedicating one such statue at the Temple of Venus on the Capitoline Hill, and keeping one in his bedroom where he kissed it at night. A brother of this child became the emperor Claudius, whose mother Antonia appears in a surviving portrait-sculpture as Venus, with Cupid on her shoulder. The "Augustus of Prima Porta" is accompanied by a Cupid riding a dolphin. Cupids in multiples appeared on the friezes of the Temple of Venus Genetrix (Venus as "Begetting Mother"), and influenced scenes of relief sculpture on other works such as sarcophagi, particularly those of children.