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Assassin's Creed Origins
I will suggest a continuation if you can of Assassin's Creed Origins. The time period is about after the death of Julius Caesar in 44 BC. You play as the same assassin's, naturally. This time, Marc Antony and Cleopatra are the enemies, and you ally yourself with Octavian (Augustus when he was crowned Emperor and adopted heir to Julius Caesar).
You'd have to help Octavian and his army fight off the forces of Antony and Cleopatra by assassinating High ranking officer's and Generals who have more skill than Octavian's and the order of Ancients that are all for Antony. You also play a pivotal role in the events before Philippi, you'd assassinate the Roman Senators that aid Brutus and Cassius as well as noble men of Rome that are with the order of ancients. After Philippi, you see yourself betrayed by Antony after he helped Octavian. Octavian also finds himself being betrayed by Antony and you two team up and fight Antony and Cleopatra.
The setting in free world should be Rome and Egypt, perhaps a bit of Greece if possible. In the end, you kill Caesarion (Caesar's son, a threat to Octavian and at the age of 18 (Caesarion was 17, but I say 18 for the fact killing kids in game is a bit barbaric). You then admit to Octavian about the death of Caesar and naturally he is upset but he reflects on all you did for him. Octavian then grants you pardon as you've been a great friend and Ally for him, and can be very useful for him in the future.