What if, when Cleopatra VII asked Antony to murder her sister Arsinoe, exiled in the Temple of Artemis in Ephesus, the younger Ptolemy was freed by Antony or by the assassin he sent to do his bidding. What if her death was fabricated to appease the Egyptian Queen? Britannia was a good place to run for. Yes, it was a completely different environment than she was used to, but it was far away from Egypt, Rome, and it was a land yet to be place under Roman control.
This scenario really doesn't change the course of history, but I am writing a historical novel on the subject right now and thought I'd share the idea with the alernate history thread.