Cleopatra's younger brother, he is the older of two sons named Ptolemy. He is destined to marry the older Cleopatra when she takes the throne as ruler, in keeping with the tradition of the rulers of the country. However, the older Cleopatra scorns this idea citing the boy's youth and inability to produce an heir. When Cleopatra takes over the throne, Ptolemy and his sister, Arinsoe, take over the country but is ousted by Caesar. Ptolemy drowns soon after the attempt to force Cleopatra from the throne.