Identify two events that octavian to become the only ruler of the roman empire. a) julius caesar named octavian as his heir. b) octavian successfully invaded egypt, causing his rival mark antony to kill himself. c) octavian formed an alliance with queen cleopatra of egypt. d) julius caesar was deeply unpopular among the plebeians of rome. e) antony and lepidus supported octavian's rise to power.