What happened 31 AD

Sejanus also began to consolidate his own power; in 31 he was named co-consul with Tiberius and married Livilla, the emperor's niece.

Octavian's forces would then chase Antony and Cleopatra to Alexandria, where they would both commit suicide in 30 BC.

Antony, who had allied himself with his lover Queen Cleopatra VII of Egypt, committed suicide in 30 BC following his defeat at the Battle of Actium (31 BC) by the fleet of Octavian. Octavian subsequently annexed Egypt to the empire.

On 2 September 31 BC the naval forces of Octavian, led by Marcus Vipsanius Agrippa, met those of Antony and Cleopatra for a decisive engagement, the Battle of Actium.