1.21
When I last wrote,
here in spoiler1, I'd just entered the Middle Ages at 975BC.
In 1050BC my seventh suicide galley had foundered, but before it sank it hailed an American galley in the distance and had established contact. The Civs on the remote continent were a bit behind the local Civs at that time. I kept contact with them to myself and profited from trade between the two continents for a long time, eventually trading contacts in 610AD when it seemed that contact between the Civs was imminent.
Soon after contacting the remote Civs I decided to throw the world into war. The Zulu were a massive power on the home continent. In 875BC I allied everyone on the home continent against them. My purposes were to 1) keep the Zulu in check, 2) keep everyone too busy to go to war with me, 3) keep anyone from trading tech with the Zulu (they were the most advanced, having learned Feudalism at this point.) It was also nice to have everyone at war with a Civ which was unlikely to reach me. The Ottomans and France were my buffer from the Zulu in the south, India and Celts my buffer to the Zulu's north. I also allied the Aztecs and Iroquois against America to slow things down on the remote continent.
For quite a while I worked on building up strength - expansion, infrastructure, and building up an army of Horsemen. During this time the Zulu continued to grow. They had a Golden Age of course and made quite a dent in the Ottomans, almost reaching the border of France. I planned to upgrade to Knights and then attack Celts and England. I'd given up my early thoughts of jumping my Palace - the initial territory didn't have a location where I wanted to do a peaceful jump and I wasn't ready for war soon enough. I figured on good odds of getting a leader while taking over the Celt and English lands, and that would provide a nice location for rushing a new Palace. (I didn't want to start by attacking France because 1) France's land was not as good a location for the new Palace, and 2) That would expose my troops to Zulu attacks. If I took Celts and England first then I'd still have India as a buffer between me and the Zulu on one side and France as a buffer on the other.)
During this time I renewed alliances or bought new ones as necessary whenever anyone made peace with the Zulu. I never allowed them peace with anyone for long but they kept growing anyway.
Also during this time Ottomans built the Great Library (which the Zulu soon took over.) That was nice, it would give me a way to catch up on tech later.
I traded for Republic in 650BC and switched to it immediately.
In 130BC I learned Engineering at the 40 turn rate and got a bit of value from trading it.
After Engineering I researched Chivalry slowly (waiting for it to become cheaper as other Civs learned it) while continuing to build up Horsemen. In 50AD I had 62 Horsemen and felt the time was right. I bought Chivalry and upgraded 45 of the Horsemen to Knights.
From this point on I left research at zero for quite a while, figuring I'd catch up tech eventually by taking over the Great Library.
I stayed in Republic during the following wars, using the luxury slider when necessary for war weariness. I first attacked the Celts and then England. Both had culture low enough that capturing cities was safe. Even the weak Celts and England were tough opponents - I lost 19 Knights against Celts and 12 more against England. But by 330AD I'd assimilated all Celts and reduced England to one town near the Zulu - I made peace and left that English town till later.
The long wars on Celts and England did not produce a leader

so no Palace move was possible yet.
Next I repositioned troops and began an assault on France. This war went quickly, I took over their last town in 440AD. During this war I acquired the Great Lighthouse from France. And near the end of it, in 430AD, I finally got my first Great Leader. The leader headed to the ex-Celt/English area to hurry a new Palace there as planned, in Mohacs.
At this point I had 42 Knights, many of them elite. The military advisor cautioned that compared to the Zulu my forces were weak! Assimiliating the Zulu was going to be tricky. Their culture, and that of the Ottamans (which matters because many of the Zulu towns were ex-Ottoman) was well over twice my culture. Flips were likely. They'd continued to grow despite ongoing war with everyone. Here's how the world looked at 440AD:
I began war on the Zulu. During this war I heavily garrisoned captured cities for one turn, then left them with just one or two units in case of flips. There were a few flips and recaptures by the Zulu but losses from this were minimal. The greatest impact was having to return troops to the ex-French lands to heal safely.
After much fighting and heavy losses, in 530AD I captured Sogut with the Great Library. It gave me eight new techs. I also got a second leader and he rushed JS Bach's, triggering a Golden Age.
I started researching again, fighting a holding battle while learning Metallurgy and then Military Tradition. I learned Military Tradition in 620AD and renewed my assault with Cavalry. In 670AD the military advisor finally conceded that our forces were about as strong as the Zulu. And at last in 780AD I finished them off.
The Zulu certainly hadn't had a problem generating leaders. Along the way I had destroyed three Zulu armies and two Zulu leaders before they were used for anything.
After the Zulu it was easy to mop up the remnants of England, Ottomans, and India. In 840AD I took the last foreign town and occupied the entire home continent. During this time I'd been building up some ships to prepare for invading the other continent.
I'd continued investing in research after Military Tradition. In 850AD I learned Magnetism and entered the Industrial Age. The Civs on the other continent are one tech behind at this point. I think that all the ongoing warfare has slowed the AI tech pace a bit.
The world map at 850AD: