In one alternative timeline created by the First Rani using the power of Iam, Ptolemy "Caesarion" Caesar was one of the children of Mark Antony and Cleopatra, (PROSE: State of Change) whereas his counterpart in the original timeline had been the son of Cleopatra and Julius Caesar. (PROSE: The Last Pharaoh)

HeCaessarionruled the Dominion with his siblings, but was minimally involved. This was because he had ventured to the edge of the Dominion with his friend Agricola and saw how finite it was. He refused his brother's request to use 'Ultimus' (an atomic bomb), knowing how catastrophic it would be in such a confined area as the Dominion. Alexander therefore planned to assassinate Ptolemy and use Ultimus anyway, unaware of the consequences.

The assassination failed, and on the day of the Games, Ptolemy goaded Alexander into the arena. They faced a pack of wolves, and the one who the wolves ignored would be ruler of the Dominion. Thanks to some pheromones from the TARDIS that Ptolemy applied to himself, the wolves attacked Alexander. After Iam duplicated the entire Earth and put it in a new solar system with the Alternate Rome, Ptolemy became the ruler without any challenge from his sister. (PROSE: State of Change)

v • e Leaders of Rome Kings, Dictators, Caesars, Roman Emperors, and Holy Roman Emperors Roman Kingdom Tarquin the Proud Roman Republic Julius Caesar Roman Empire Augustus • Tiberius • Caligula • Claudius • Nero • Galba • Otho • Vespasian • Trajan • Hadrian • Antoninus Pius • Marcus Aurelius • Elagabalus • Constantine I • Maxentius Western Roman Empire Valentinian Holy Roman Empire Charlemagne • Frederick II • Maximilian I Byzantine Empire Leo • Zeno • Justinian • Nardole Alternate Rome Roma I Augustus • Nerva • Trajan • Hadrian • Antonius Pius • Marcus Aurelius • Avidius Cassius • Septimus Severus • Publius Septimius • Claudius Gothicus • Domitius Aurelianus • Diocletian • Constantine I • Julius Alexander • Justinian • Carolus Magnus • Octavian VI • Cosimo • Romulus Augustus • Emmanuel Victorius • Eugenius Roma VI Diana Roma XIII Hieronymous • Crolix LI Roma LVIII Constantine I • Flavius Venerarius Roma CI Constantine I • Flavius Venerarius Roma D Adolphus Caesar Roma DCX Nero Germania I Honorius Terra Nova Marcus Antonius • Cleopatra Selene • Alexander Helios • Ptolemy Caesar 20th century Margarita River Song's World Winston Churchill