Persian Invasion is a modification for Rome - Total War 1.5 that begins in 490BC. The vast Persian Empire celebrates a golden age of prosperity, and looms over the smaller states that surround it. The king of Persia, Darius the Great, is a tolerant leader, but he has not forgotten what happened in Ionia, and may yet seek revenge for Greek treachery...
This modification for Rome: Total war is simply the best mod for Rome. :D