Who was Cleopatra's rival?

Cleopatra had several rivals, afterall she was an ancient queen and ancient rulers always seemed to have someone trying to oust them. Her main rival was her sister, Arsinoe, who was very popular with the Alexandrians. Her brothers were both rivals for the throne and one even made her go into exile. She also had rivals in the area of influence over Marc Antony. They were two of his wives, Fulvia and Octavia.