“After Actium: Two Caesars Are Not Enough” is a TL following the development of Roman and Asian affairs in a scenario where Octavian dies shortly after arriving in Alexandria, resulting in the survival of Queen Cleopatra VII of Egypt and her children.
The major POD is the death of Octavian upon his arrival in Alexandria (30BC). The malaria which afflicted Marc Antony's troops spreads to Octavian's camp as Antony's men defect to him. Ptolemy Caesar, better known as Caesarion, is captured and brought to Octavian, as per real events, but Octavian dies before deciding the boy's fate. Word arrives of a plot back home (also historical) on behalf of the sidelined triumvir Lepidus. Caesarion is made a Roman citizen and included in Octavian's hastily amended will, which leaves Octavian's right-hand man and colleague Agrippa as his main heir. In Agrippa's hands Caesarion is a useful tool to manipulate the mob and get them on board with Agrippa, now Caesar Vipsanian. Cleopatra is deposed as Queen of Egypt and handed over to Artavasdes, a former ally Antony had betrayed shortly before Actium.
A minor POD is a second marriage for Ptolemy XII Auletes at the time of his return to Egypt (circa 54BC).