 Despite this marriage, Antony carried on a love affair with Cleopatra, who bore him three children, further straining Antony's relations with Octavian.Lepidus was expelled from the association in 36 BC, and in 33 BC disagreements between Antony and Octavian caused a split between the remaining Triumvirs.Their ongoing hostility erupted into civil war in 31 BC, as the Roman Senate, at Octavian's direction, declared war on Cleopatra and proclaimed Antony a traitor.