Assume that there is not An Lushan rebellion, or comparable rebellion around the same time. The Tang Dynasty, meanwhile, has a broadly similar list of Emperors to our history after the rebellion: a complete mix of a few quite competant, a few horrible, and plenty of mediocre, all with a dash of the usual 'This Emperor went nuts and died early, all due to his immortality elixir.'
How long does the Dynasty last before it collapses?
How long does the Dynasty last before it collapses?