Ravellion
Prince
Yes, that's emperor. Note that it's not just riflemen; gatling guns and cannons too.V3 improves AI tech/building/expansion/worker/specialist logic.
Note that I'm considering removing the free techs from the AI now
By T170 you can expect Riflemen on the higher difficulties. Was that Emperor ? That's still pretty early for emperor.
I also just lost a turn 70 Rome 8 spearmen/3 archer/1 ballista/1 warrior attack. I'm moving down to King I suppose, where on "non Acken" I played Immortal reasonably comfortably.