Built lots and lots of units.
Settled Chokonuts Island, there is room for another city on it.
Have two settlers ready in Khosan, with defense and the last missionary on the way in Assyrian. A Galleon has just arrived to ferry them to an island.
On turn three Saladin started a golden age, and Cyrus got chemistry, at turn ten he is still the only one, and none has Astronomy.
Steel is in next turn, where do we head after this? Towards printing press and replaceable parts? The first couple of turns should be used to gather money for upgrading Trebuchets.
On turn nine we get a great Artist in Nidaros, so we're ready for a golden age if we want to.
Battle report:
Turn 5: Cyrus has apparently withdrawn a lot of troops, so I move to attack Haithabu, so we can use those grennies.
Turn 6: Took Haithabu with few losses.
Turn 7: We instantly get the attention of our enemies, I judge that we cannot keep the city, so I withdraw to the hill.
Turn 8: No turnset without a skirmish with a Camle Archer, it beat of two attacks at 85%, before it gave up.

We are building up a nice stack on the hill, with the trebuchets upgraded, and the grens on the mainland, I think we can capture and hold a few cities.