The best I was able to come up with was 2200 BC. I cannot for the life of me figure out how you people got units all the way to Madrid and Tenoch in time. I had no trouble taking down Thebes, since they only have one warrior unit for the first several turns, and I got to Kyoto quickly with the Galley from the 2nd bararian village to the east. But my units can't move fast enough to take down the last 2 civilizations by 2800. I've tried to upgrade my units to March by doing battles but every time the only upgrades I get offered are Blitz and Infiltration. Not sure what else I can do to shave off turns.