The alliance among Octavian, Mark Antony and Marcus Lepidus, commonly known as the Second Triumvirate, was renewed for a five-year term in 38 BC. But the triumvirate broke down when Octavian saw Caesarion, the professed son of Julius Caesar and Queen Cleopatra VII of Egypt, as a major threat to his power. This occurred when Mark Antony, the other most influential member of the triumvirate, abandoned his wife, Octavian's sister Octavia Minor. Afterward he moved to Egypt to start a long-term romance with Cleopatra, becoming Caesarion's "de facto" stepfather. Octavian and the majority of the Roman Senate saw Antony as leading a separatist movement that threatened to break the Roman Republic's unity.