Opening scenes in shakespeare's plays (Antonio and Cleopatra)

In the first and the second scene, Shakespeare introduces the death of Antony's wife, Fulvia, and he must come back to Rome. Furthermore Sextus pompeius decleares war to Caesar to “command the empire of the sea”. So Antonio must come back to Rome to guarantee peace helping Ottaviano Augusto and Lepido, although Cleopatra tried to be reamain Antonio in Egypt.