@Seraiel: I had read your last post too late and already continued. Good thing is: If I had moved the Settler towards the West Copper the same kind of collision probably had happened with Monty's Settler

(see the following events...)
Lots of good ideas here and all have their Pro and Contra! But I had to decide now and went for FlyingSwan's original proposal to settle 1E of the River-Ivory with the idea to farm the flood plain to feed the second city.
Interesting thing is that Gilgamesh's Settler retreated to the tile 1N of his position and settled there.
@Pangaea: I was curious what would have happened if I had moved my Settler 1N into the Jungle and reloaded the save. And indeed Gilgamesh settled then where he was (i.e. 1S of the location where his city is now) as you have guessed. But I don't want to cheat and live now with my decision
Turn 46 - 2160 BC
- Second city founded, Warrior in production there
- Warrior survived Lion, Scout survived Wolf
- Another warrior finished, Settler in queue
- Judaism founded in a distant land
- Montezuma founded Tenochtitlan "in a distant land" (however it's not "distant", it's towards my direction!)
- Mansa Musa adopts Organized Religion
- Charlemagne built Great Wall
- Gilgamesh's second city pushed borders, touching my borders now
- Mansa Musa founded Djenne in a distant land (also not so "distant", see screenshot)
- Pottery finished, Writing in research now (9 turns to go)
- Worker finished farm on the flood plain
The turn 46 is half-finished. I can still move the Worker and whip the Settler now.
Current status is:
- Settler can be whipped now and then start to move at the next turn
- Units: 1 Scout, 1 Worker, 4 Warriors
- Buildings: None
- Improvements: 3 Farms (the 2 corn tiles and the FP), 1 Mine
- 11 of 15 hammers invested into the next Warrior (I interrupted when the capital had size 4 and put the Settler into production)
- 4 turns to go for a Warrior in Uppsala
- I can't see Monty's second city yet (probably at the coast) but from his borders it's obvious that he has his fingers on the West copper.
- Not sure if I still should aim for the Gold as Mansa is close there and I doubt I can afford another poor-food city
Main questions now:
- Where does the third city go? I would consider somewhere around X2/X3 to block Monty (preferably X2 to secure the sheep?). Or towards East (around X1)? Or maybe in the Southeast around crabs/sheep?
- What should my Worker do next? I'd say a Cottage 1W of the farmed FP or do I need that tile possibly for another farm for Uppsala as I don't see any other option to farm something and improve food supply for this city before the borders get pushed (not soon)? On the other hand I really don't need more food for the capital and would normally prefer a cottage there. Or should I prioritize connecting the cities?
- I guess I should consider whipping a Worker when the capital is at size 4 again as my only Worker starts to get overloaded with 3 cities. During the regrow phase I'd build a Granary (and maybe chop it partially).
- Defense? Is that enough what I have? Can I really wait with Archery until I have Alpha and can trade it?