The aftermath of the Incident of Xuanwu Gate. He had slain Jiancheng the Crown Prince of the Empire at Prince Shimin's order. But until then did he find it was all but a conspiracy. Now the mistaken was caused. Were the Templars behind everything?
Well AC Unity will take place during the time of the French revolution (I think) which happened around the 18th century I think. That would be the late, late 1700's so ya... Anyways you never know we might get to travel to china eventually in unity because I don't just see the whole of France as a step up from black flag but more of its on the same level. Though I could be mistaken on its better or worse but there is no way any assassins creed game can be bad anymore. It's impossible, they are all just way to awesome.