Yes, all the civ has done strange things to my brain. Sorry, my tyop. 630AD, more luck with techs at the start of the middle age would make 550, possibly it could be improved a couple of turns by getting through the AA quicker. If I do it again I'll keep exact track of what techs I get when.
As for Deity 100k, eep. I think early deity conquest is going to be the best option, and then go hard for culture instead of trying to milk. Never milked a game, and rarely go for early conquest, that was the actually the last game I submitted to try something different for me. My first couple of attempts were India, Large pangea map, Deity, no barbarians and expansionist opponents. That one is a write off as a 100k game, but I think I can turn it into a 20k or diplo win, provided I can stay alive.
2nd was Celts, small archipalego, Deity, with Zulu, Mongol and Aztecs. Again, no barbs. Got the temple of Artemis, and cranked out the cities like mad, and I am still only 2nd in culture, and falling behind the mongols. Decided to drop the difficulty and try similar tactics, and it's working well.
Celts, Tiny Acrhipelago, Monarch, with Zulu, Mongol and Aztecs. Built the temple, cranked out the settlers, and I'm now at approx 15k culture, and 234cpt. Nearest culture rival is under 4k. I won't research education, my island is impregnable until somebody else gets amphibious warfare, which is unfortunately costing a lot of money, I think I probably should change to Monarchy. If I hit return 200 times, I'll get a 100k win around turn 400. Similar tactics should work on emperor, possibly demigod, but I think the AI moves too fast for it to work on Deity.