Final answer:
Octavian and Agrippa captured Alexandria.
Step-by-step explanation:
The city that Octavian and Agrippa captured was Alexandria. Octavian's naval forces defeated those of Antony and Cleopatra at the Battle of Actium off the coast of northern Greece. After the battle, Octavian invaded Egypt in 30 BCE, resulting in the deaths of Antony and Cleopatra.