Round 3, 825 BC - 50 BC (31 turns):
Techs: Writing, Aesthetics, Mysticism, Polytheism, Code of Laws, Iron Working, Priesthood, Meditation, Alphabet, Mathematics (part), Monarchy (part).
I researched Writing first with the goal of getting Literature and TGL. After additional calculations I noticed that my third city Lalibela would be a better GP farm with 4 specialists at size 7 compared to 4 at 8 in Libyan (miscalculated before).
800: Christian shrine BIDL. Nappy converts to buddhism. I trade sheep for sugar to Joao.
775: Trade wheat for dye to Joao.
750: I found my 4th city with the goal of getting marble in 3rd ring.
725: Writing -> Aesthetics. Nappy starts a golden age. SP BIDL, not good that going this early it means someone's had Aesthetics for some time.
600: I finish scouting the western landmass, it turns out to be a small island which will support 2 cities nicely. A barb city unfortunately popped up the same turn I landed a chariot and will need to be dealt with.
625: Joao converts to buddhism.
575: Joao aquires Alphabet and he has Aesthetics, curses! He's not the one who built the SP either.
500: MoM BIDL (Joao).
475: Aesthetics -> Mysticism. Confucian shrine BIDL. Nappy is WHEOOHRN. If he's after me I'm dead.
425: Myst -> Poly. I attack Libyan who has 4 archers (1 CG) with 8 level 1 chariots and a c1+cover archer with 7xp. I lose 6 chariots in the first wave, killing 3 archers and badly wounding the last, my archer wins a fight putting him at 9 xp.
400: I lose another chariot then attack with my archer at 71% odds and succeeds! He captures the city and reaches level 4 to unlock the HE.
350: Poly -> COL. The reason for starting on COL is that TGL is BIDL this turn on the other continent.

AP BIDL (Jewish). SoZ BIDL (Joao). HC gets Alphabet and I make my first tech trade (enabling COL research).
There's also a great work and it's not good news. We are getting pwned by the other continent.
300: A GS is born in Aksum at 53% odds, no Murphy's law about getting a GM after all. I use him for an Academy in the capital.
250: Nappy gets Alphabet and suggests a trade which I accept.
There's a barbarian uprising by my eastern borders consisting of 4 swordsmen, what are the odds?
I switch to slavery in order to whip another archer and send 2 nearby chariots down to join the lone archer already guarding the city. This proves to be just enough as my 2 archers wins their battles the next turn, making it a 2 for 2, I then kill both the remaining swordsmen with additional units.
225: So did I find any iron you ask? Indeed there's two sources I plan on getting my hands on, the first easily available and I seize on the opportunity to bolster my army.
200: I do a trade with Nappy (why didn't I trade for Monarchy?). I guess I was a bit overconfident in my trading ability. Well at least it's needed to unlock a philo bulb.
175: Good news everyone! Nappy dows Joao, apparently religion wasn't enough. I foolishly missed that Gondar actually got buddhism in 250 bc and convert when I realise my mistake.
The war makes diplomacy a bit less straightforward. I decide to cancel OB with Joao and switch the wheat for dye trade from him to wheat for wine with Nappy. I keep the sheep for sugar trade for now as Nappy has sheep and HC has no spare happy resources to trade me for it. Both Joao and HC has HR as favourite civic which we will all have adopted soon, Nappy will have to be handled more delicately as he's apt to throw a tantrum if he feels slighted.
100: COL -> Maths. I start on Maths with the goal of making a double trade next turn with HC and Nappy.
75: The next turn HC gets COL himself however so I switch research to Monarchy to try to trade for that with Nappy.
50: Nappy threaten me for COL. I think long on this but eventually I decide to give in. I don't feel like I'm in a position to piss him of just yet and as soon as the war with Joao ends he's going to be looking for excuses to attack me. That might be sooner rather than later since Joao is 3-0 in GGs thus far.
Giving in puts Nappy at pleased and since both the others are also pleased with me I decide it's a good time to beg a little. Nappy and Joao each gives me 40 gold but HC refuses. At last conclusive evidence that begging for 40 gold doesn't always succeeds even if it's the first time you ask (he had 50 total btw, I don't know if that affects his decision).
With all my plans shattered and scattered to the wind like usual I decide to end the round to consider my options and let you chime in.
First some landshots:
My 2nd source of iron is on the island, looks like a decent production city with workshops, HE material? 17 prod at size 6 with caste and MC, without lighthouse.
I'm advancing in demographics.

There's a war abroad I think, at least an unknown GG was born and I think I've mapped out all Nappys cities.
Techs and relations:
Joao is the worst enemy of Nappy so care needs to be taken in trading with him, thus far he's not overly angry at Nappy though although he got attacked! Mostly bc of shared civic.
I need to decide on a new techpath, here are some options:
Monarchy: Enables HR for happiness and +relations with Joao and HC (the latter just sent an axe to scout my lands, his SOD are in his southernmost city which is closest to all of us so that doesn't say much).
Maths: Unlocks Calendar for 2 nice incense tiles for the capital. Also unlocks Civil Service and a Philo bulb with my next GS.
Literature: Unlocks the NE and HE.
Drama: Can be traded.
Compass: Can be traded. Harbors gives at least +3 commerce with GLH.
I have part of Maths and Monarchy researched already.
Should I switch from slavery to cs to speed up my next GS? It will be difficult to get him in time to bulb philo before at least one of the others gets it but it might be possible with some luck. Lalibela can decrease ETA from 21 turns to 10 or 11 if I make the switch.
Anything I should consider in regards to my builds? I'm currently focusing on units to clear the island and have started on a settler in the capital though I need 3 settlers in total to settle the rest of the land once the barb city is gone. I guess I also need to decide how many cottages and how many farms to go for. If I delay the NE then it makes more sense to run specialists everywhere soon to get the next couple of GSs sooner.