Julius Caesar and Mark Antony were extremely important in Cleopatra's true story. Caesar helped her regain the throne. Antony was her lover and they formed a strong political and personal bond.
In Cleopatra's true story, aside from Caesar and Antony, Octavian was also important. He was the one who ultimately defeated Cleopatra and Antony at the Battle of Actium. Also, her own family members within the Ptolemaic dynasty were important as they were part of the power struggle in Egypt. Her father's death led to her rise to power and she had to deal with her siblings who also had claims to the throne.
There were several important people in Cleopatra's true story. Julius Caesar was the first Roman figure to play a major role. He was a powerful Roman general and politician. Then there was Mark Antony, her lover. Their relationship was the stuff of legend. And Octavian, who later became Augustus. He was the one who brought an end to Cleopatra's rule. Also, her servants and advisors within her Egyptian court were important as they helped her manage the affairs of the kingdom.