
Arsinoe IV was exiled to Ephesus, and Caesar, now an elected dictator, declared Cleopatra and her younger brother Ptolemy XIV as joint rulers of Egypt. However, Caesar maintained a private affair with Cleopatra that produced a son, Caesarion (Ptolemy XV). Cleopatra traveled to Rome as a client queen in 46 and 44 BC, staying at Caesar's villa. When Caesar was assassinated in 44 BC, Cleopatra attempted to have Caesarion named as his heir, but this fell instead to Caesar's grandnephew Octavian (known as Augustus by 27 BC, when he became the first Roman emperor). Cleopatra then had Ptolemy XIV killed and elevated Caesarion as co-ruler.