v1.21f
Wow!! What a challenging game!
I decided to use a joined worker to rush out a settler build faster. My Settler went West, with the intent to form the 2nd city on the plains space just North of the start position. On turn 2 Babylon was established, and this initial move happened to bring the Wheat space within range (after cultural expansion.) So my worker Mined and Roaded the initial space (9 turns), moved NW (1 turn), Roaded this space (3 turns), joined Babylon on Turn 14. Settler completed on turn 15, and Ur established turn 16. 5 Turns later Babylon bacame size 2 again, and 1 turn later rebuilt the Worker (after building a warrior). Meanwhile, Ur has finished 1 Warrior, and has nearly built a 2nd.
By 1000 BC I had about 7 towns established, and was feeling the pressure from Rome. What a gorilla!! I was totally boxed in, and could see Iron and Horses just outside of my reach. Meanwhile, both Rome and the Celts were researching far faster than me (of course), but Rome was the one with more Techs. So I'd end up paying Ceasar for a Rome-unique Tech, than trade it to Brennus for one that they both had. Net result was that Rome was pulling far ahead. So, I tried building towns adjacent to the Iron and Horses to gain them culturally. (BTW, I built my town 2 spaces SE of the Roman town; Rome didn't declare War against me, but I did have 2 or 3 gpt deals with Ceasar at the time.) I think Rome matched me in culture, so that wasn't working. I did research Literature first, and it was decision time. I started building Veteran warriors for upgrade to Swords, and started saving every gold piece I could. Around 400 BC I saw Rome go into anarchy on the F3 screen; probably switching to Republic; things are only going to get worse!! So I made a deal with Ceasar for one of his 2 extra Irons, and upgraded about 12 Warriors at that time. Then I moved them onto the central Iron Mountain; he demanded I withdraw or declare War, which I did!! (Talk about a major reputation hit - huge stack of units already in Roman territory, and 3 current gpt deals broken!) I took and sacked the Roman town (did NOT want to risk any flips!!), and I finally had a Iron source of my own.
So from 350ish BC to about 150ish AD we hacked at each other. My town near the Mountain Iron was across the river, so he never really challenged it (too strong a defensive position). And to the Northwest, I had stacks of spearmen defending in the Incense hills, so that wasn't a good position for Ceasar to attack either (he still tried!) Neither of us had many units to attack in the SouthEast, so almost all the action was at the Horse resource. I'd established Elippi right there, and he had Antium just on the other side, so he sent waves of Legionaires and Archers attacking Elippi, and I added waves of Spearmen, Swordsmen and Bowmen to defend it. The body count was high, but I eventually wore him down, and finally pushed through to take Antium. Exhausted, we signed a peace treaty where he gave me all the Techs he could. This didn't include Republic, since I did not already know CodeofLaws.
Meanwhile the Carthaginians had built Great Lighthouse and visited us. Here we are, hacking away with Legions and Swords, while the other continent is building Sistine's and Copernicus'. After peace broke out, I still needed Construction and Currency to leave the Ancient Ages. Luckily Brennus had Const and was missing Poly, so we quickly traded. I was saving money by this time, and shortly later was able to buy Currency from India (for some unknown reason, no one would take a gpt deal from me!

) My free tech was Monotheism, which I was able to trade with someone for Republic.
I started building lots of Marketplaces, building up my population and saving my money. I started on a 40 turn, minimum research for Engineering, which I eventually learned. Under Republic I was earning about 80 gpt, which improved up to about 140 gpt by 600 ADish. I was also building Veteran Horsemen, 27 of them. I knew I'd have to buy my Techs, and with Cash, so my treasury was growing. In this manner I bought Feudalism and Theology and started upgrading my Spears to Pikes. Just before learning Eng I was ready to buy Chivalry; what do you know! Brennus has it and doesn't have Theology!! I saved about 700 gold that way, and started doing mass upgrades to Knights. Engineering is learned, allowing my Knights to ignore river crossings, and war is resumed against Rome (600 AD or thereabout). This went much better, and by the mid-700's I've taken or razed all but 2 Roman cities, and give peace in exchange for Education and Invention.
On the other continent, Carthage and Japan have been at war for as long as I've known of them. Japan is gradually disappearing, so they wont be an issue; but Carthage and India are large. Just after I declare peace with Rome, India declares war against Carthage

, and for the rest of my Middle Ages (I say mine, because India is already in the Industrial Age!!) India starts dismembering Carthage. I begin buying Techs; mostly from India because they give slightly better prices, but I start to buy some from Carthage to help out against India. I buy Banking, and start building Banks. I'm up to 5 Luxuries now, so most commerce goes to Taxes. I buy Astronomy, then Economics. I make a deal with Rome and trade for Gunpowder. My gpt is going up: 150, 175, 200 gpt. I buy Chemistry, then Physics. Carthage is starting to hurt, and trades me a Luxury and Theory of Gravity for Iron. My gpt is 250, now 300. I'm able to buy Magnetism, and trade with Brennus or Rome for Metallurgy. I'm now Industrial (1030 AD.) In all my Tech purchases, the most I paid for any tech was about 1300 gold; at 300 gpt that's 5 turns, which is a pretty fast way to catch up. Taking the Great Library wasn't an option!!
My free Tech was Nationalism. Rome has also become Industrial (all 2 cities), and has no IA Techs. Carthage has Nationalism and MilTradition. India has Nat, MilTrad, Communism, and Steam Power (maybe some more up the Steam Power track.) Brennus is missing Magnetism, and Japan is even further behind. I'm building up more horsepower, preparing for a mass Cavalry upgrade. Not sure if I want to take India on while Carthage is still around, or pacify my continent. To date I haven't built ANY libraries! I'm glad I wasn't alone with Rome on my continent; Brennus has actually been quite useful to trade Techs with, since he isn't way ahead like everyone on the other continent.