Predator
Right around the time entering MA, I have a big hole in my CA2 autosaves, so I don't know exact dates.
Still in AA, I had reached the other continent traded for all techs, maps and money around and then started the big phony war.
Declared on the big ones France, India and Korea and allied the small ones Spain and England against all three.
The alliances were coupled with peace treaties and predictably both broke an alliance after some time and gave me war happiness by that. Spain really put some suspense in it and took until 1 turn was left on the alliance

.
I then reversed the alliances, so everybody on the other continent stayed occupied.
That backfired a bit, because they were then so slow in tech that I had to wait on them a few turns.
Free techs I could trade were monotheism and engineering and by the time I had researched to astronomy (10 BC) there was just feudalism available for trade.
I then researched chivalry (70AD) and continued with navigation to let the AI research invention. Still had to wait 7 turns after the navigation research until 2 civs had invention, but made good use of the money by upgrading horses.
Bought invention in 300AD, just in time for a golden age by attacking one of the last Romans.
Then burnt through to MT in 430AD (France helped with gunpowder).
Research stopped for the rest of the game.
I got my first leader to build Leonardo's in 400AD only, so before I had to pay full price for upgrades.
In 70BC started the real war on Greece with a handful of swords and horses taking Athens. By the end there were also MDI and knights taking part.
I performed a free palace jump into Greece after I had all but 2 of their cities (130AD) and gave them a small break.
Last Greek city falls in 210AD, while the troops are already mostly in Roman lands (DoW in 190AD).
Romans destroyed in 310AD and knights shipped into India. India had declared already in 170AD, but up to now it was phony.
The knights took a few villages and established a foothold, but the tough work was done by the cavs a little later. India was down to 3 towns in 490AD and got a small break. There final defeat was in 550AD.
Meanwhile I had dispatched off Spain that was anyway reduced to 3 towns by India.
England also did not show much resistance and was gone in 580AD.
The big war on the other front in France had begun in 480AD with a 3 caravel landing of fresh cavs form the home island. A ship chain delivered reinforcements every turn, still France was pretty tough with lots of musketeers and even a few cav counterattacks. I had sold them metallurgy to cancel their Great Wall and they researched MT then pretty quickly.
Still France left the scene in 580AD.
The two columns converging on Korea didn't leave them much of a chance and their last city fell in 610AD for conquest victory in 620AD.