I beat Deity by 1700AD with Aztecs on Domination Victory. You have to train your 1st warrior and lead him out to explore. I didnt mess with any barbarians because you need to save them for exp. Max your city out to science and research Horseback Riding ASAP. I explored as much as I could to get more gold and specials. Once Horseback Riding is discovered, max your city out to production. Screw around til you get your first Horseman, and research either Pottery or Bronze Working next. I didnt worry about defending my city because if barbarians came out the hut, I rush a unit or two to defend it. The Zulus will attack an empty city as well but dont worry too much. Use that 1st Horseman to gain some exp while you build the next 2 for an army. I got my 2nd one in 5 turns. The 3rd one I rushed. Cleopatra and Elizabeth were right next to eachother on a peninsula. I had to build a Galley to port my army to them. I also got a free spy, and shipped that too. I declared war on the Egyptians first. Station your army in a forest IF there are no hills adjacent to the enemy city. The best units anyone will have is Legions and Archers. You can take Legions out with ease. Some civs wont have an Archer army and if they do, they will only have one. Use the spies to disrupt fortifications and the odds will be 15 12. Once your Horsemen army have veteran status, their attack will be 9. But add a little Infiltration with that and a Great General and it will be 15. A fortified Archer army in the capital will be 15 also, but when disrupted it will be 12. I took Cleopatra out. By now, you should know what to research by then. I didnt worry about growing my capital city because you will be taking other cities, and the other AI seem to react to that. The AI knows when you're tough and they actually wont bother you, but they will prepare. Next was Elizabeth, I had a bit trouble with her but she had only 2 armies but I had 2 spies. She was also adjacent to a hill which is a no no. I took her out. She asked for peace but I said no and wiped her next city out and she was finished. Next were the Mongols. Surprisingly, they didnt mess with me. Genghis Khan has had a little more time to up his defenses for you now. So when attacking your 3rd civ, I would strongly recommend researching Mathematics to get some siege units ready. As you would know, the Mongols have the ability to turn barbarian villages to theirs, so they will have a lot more cities to work from, just head to the capital and station your Horsemen army with an Archer army to protect them, AND place them in a forest. By this time, it should take you an average of around 3-6 turns to research anything if you make sure each city is producing science. Declare war on Mongolia, but dont attack. When he sends his armies at you take them out with the Horsemen army. Hold your own with defensive units until you can make a Catapult army. A Catapult army has 24 attack, and NO civ will have Musketmen at this time and they just MIGHT have Pikemen. But Pikemen still wont do good against a Catapult army. I took Genghis Khan out with them. I was able to research Gunpowder to for fun to ensure my defenses, because someone might discover Feudalism soon. Next was the Arabs. They had a lot of time to prepare but they were still behind in tech and they most advanced unit was the Cannon. I had the Musketman army protecting my Horseman army and Catapult army. I took out the Arabs. By 1700AD I was done and I dont think he was even in the Modern Era yet. With that 1st Horseman army I won 50 straight battles. I took all the cities and made only one city with the free settler. More tips: -Have ALL cities produce science, but the free settler you get for 100 gold, use that as a gold city. In the middle of the game use some cities for gold. -Cities that have the least chance of getting in trouble, build as many buildings as you can. -Use Great Builders ONLY for wonders. -Never settle a Great Merchant. -The cities closer to the enemy make defensive units and siege units. -If the Scout ability is available get it ASAP because it helps. -Recruit some naval units because Naval Support will be helpful on conquering the 3rd and 4th civs. -Make Granaries and Harbors anything that can make food. Settling cities near Whale and Fish will set you up good. -Settle and use resource tiles effectively because some are very versatile. -By some point in the game you will be ahead of everyone in every victory. Probably not cultural if you play a civ that have cultural advantages. You'll be able to win Dominantly, Technologically, and Economically. Culturally will take a bit longer but its possible. If you have any more detailed questions on what I did then just ask I'm sure I can answer. I won with the Aztecs. If you definitely want a tech victory you could go with the Japanese of course and use the island strategy.