Page "Augustus" Paragraph 20

However, despite the fact that he never officially bore the name Octavianus, to save confusing the dead dictator with his heir, historians often refer to the new Caesar — between his adoption and his assumption, in 27 BC, of the name Augustus — as Octavian.

Mark Antony later charged that Octavian had earned his adoption by Caesar through sexual favours, though Suetonius, in his work Lives of the Twelve Caesars, describes Antony's accusation as political slander.