Hrmpf, after I couldn't get through the "Server is busy" replies from CFC yesterday, let's try again today...
During the interturn, Montezuma came and complained about our armies amassing at his borders. These armies were...our scout.

He would complain another time during my turnset.
Turn 66: A newly arrived Ottoman warrior gets bombarded by Edirne and our chariot archer and then splatted by a spearman. A settler near Istanbul can be seen. In addition, our empire becomes unhappy.
Turn 67: During the interturn, a new spear comes out of Istanbul and attacks our spear which had killed the warrior. The attack is across a river and in a forest, so the spear fails to kill our spear. An Ottoman worker hides under the wounded spear and gladly surrenders to our spear when he charges to finish off Suleiman's wounded spear. Yes, this attack was also across the river, but thanks to being on flat lands a decisive victory nonetheless.

Since our spear is at 2 hitpoints now and in range of Istanbul, I decide to instaheal him.
Archery comes in, and I start us on Mathematics.
Turn 68: Washington has reached the Classical Era. I capture the next worker, start to bombard Istanbul and advance on the city with our spears.
At Edirne, the workers have finished pasturing the cows, and I move them to the silks. I think it would have been better to improve the silks before the cows, as we're short on happiness at the moment and cannot afford to grow much anyway.
Turn 69: During the interturn, Suleiman came again asking for peace. I declined.

Instead, I bombarded Instanbul with our chariot archer and attack with three spears.
GG Suleiman!

Thanks to my predecessors for the nice setup for finishing him off.

I decide to puppet Istanbul. We should discuss what to do with Istandbul and Edrine next (see below).
I sell horses to Washington for gold and make peace with Helsinki. Having to recover our -60 relationship with Helsinki sucks.

While looking over our global relations with the AIs, I notice this:
Do I read this correctly - we are secretly scheming with Caesar against Bismarck while having a pact of cooperation with him?

Is there some higher purpose or is this an Succession Game lack-of-coordination artifact?
Turn 70: Monte wants us to fight against Washington - I politely decline.
A spear has scouted the area west of Istanbul and found this:
I suggest we found a city on the spear's hex eventually - whales are nice and might otherwise be hard to get, and two fish, cows and two hills make for a nice city.
Ptolemy publishes a list of people with the pointiest sticks.
We're not first, but first on our landmass.
Turn 71: The Hanging Gardens get built in a far-away land.
The rest of our turns were fairly uneventful. Every single turn, the game bugged me with a notification that our horse deal with Wu has ended, but the deal never left our list of "current deals". A bug?
After the silks were connected, our happiness got positive again. Our economy sucks though, we're still losing gold. I focused on our road net, and in two turns all of our cities will be connected to Moscow at once. That should bring us back into the positives again.
Without thinking about it much, I had set Moscow on building stables which was probably a

decision. We have too many units anyway at the moment and won't build more horse-based ones in the near future. Is there hammer decay in Civ 5? If not, the next player might consider changing production.
St. Petersburg is building a circus to deal with our happiness situation. At +3 happiness for 4 gold upkeep, it's less efficient than a colliseum at +4/4, but those will come later.
Research is currently on Writing, for libraries. I think we should go for Iron Working next, for Catapults and Swordmen.
We should discuss what to do with Edirne and Istanbul. My suggestion would be to raze Edirne and annex Istanbul - what do you think? I didn't want to decide something big like this on my own.
We also have lots of money to spend. Allying with Helsinki is very expensive, now that they are at -56 or so. If we want to do this, we should probably save more money until we reach 1000 gold. Until then, Helsinki will be less hostile. On the other hand, there might be more useful things to spend our money on, like libraries or a settler for the whale site (what tech do we need for whales? Optics?) or...?
Here's the overview map:
We have a scout at New York's borders. Behind the city, there's still fog to reveal - unfortunately, Washington does not have Writing yet. So once we have, I suggest negotiating open borders with him so our scout can move through his territory.
Roster:
Kylearan -> just played
Aretii -> UP
SleepingMoogle -> on deck
Gold Ergo Sum
MuLepton