Who did Octavian become?

Octavian, as Caesar's heir, called himself Caesar, became a Triumvir with Marc Antony and Lepidus - they split the empire amongst themselves, Antony taking the east, Lepidus palmed off with North Africa, and Octavian the west. Civil war ensued, and after he had defeated Antony at Actium, Octavian set himself up as First Citizen and kept control of the army and frontier provinces so that no challenger could bring on more civil war. Looking for a title, and determined to avoid the label of kingship which had brought the knives out against Julius, called himself Augustus.