1744
Cathy is not so great any more. Something happened I had never seen before. Cathy had a vassal, Suleiman. I went after Cathy and took over 1/2 of her cities, and then was surprised when she accepted a peace that involved her giving me a size 10 city. The AI is usually doesn't want to give up cities. I was fighting Longbowmen and Knights with Cannon, Infantry and Calvary.
The strange thing was that the turn I sued for peace, Suleiman broke free of Cathy, then on the same turn, Cathy became of vassal of Suleiman. I think it reset the normal 10 turns of peace, because I think it was only 5 or 6 turns later that I was able to declare on Sulieman and just about finish Cathy. She now has only 1 or 2 cities and is no longer a factor. Never had to fight Sulieman, but he gave me plenty at the peace talks anyway. I got very lucky with Cathy. The turn I declared the second war on her, she finished Versailles. So I got that Wonder, in a good location, without having to build it.
So that's my largest opponent removed, but now for the toughest, my ally Ragnar. But it will be "Shock and Awe"

. I've recently starting building tanks and he has only Cuirassiers I think. Haven't seen any Cannon. His area is right in the middle, and I surround him on 3 sides. I plan to place all my tanks for a quick kill. They will probably be attacking without artillery softening up, so it will go quicker. I can afford a few tank losses in exchange for speed. It will take me a bit to set up the attack, giving me time to finish spreading Mining Inc. and get Cereal Mills a bit more widespread, as I had just got that company going about 10 turns ago.
My other closest ally is Tokugawa of all people. He started on the opposite side of the continent from me, and when he starting fighting I would declare war on his opponent. A few shared wars and he got very friendly. But even with my help he is still an also ran and should be easy to stab when the time is right. Suleiman will be my next victim, after Ragnar. I also have Justinian to finish off, but his growth was stunted a while ago when in our first big war when I along with, Ragnar, Tokugawa, and for a short while Hannibal, took on the rest of the world. Ragnar took several of Justinian's cities and Byzantium never recovered. (Hannibal later foolishly back stabbed me. He is now down to one city, off of the main continent.)
It has been non-stop war for a long while, but it looks pretty good. By the end of the Eighteenth Century, I should be pretty well set up with all my opponents weakened. Then I it will be mainly saturating the map with as many cities as I can place without going over the domination limit. That's the plan anyway.