1: Vandals
Cloudberg:
Going into this season, most of us had low expectations for the Vandals. In past AI games their performance had ranged from mediocre to downright disastrous, and usually the latter. But Genseric defied those expectations from the very beginning. He expanded rapidly, settling numerous cities, including in Spain, and built a respectable navy. Thanks to their strong army and weak neighbors, the Vandals rose to the top ten in episode 3 and stayed there until episode 14, in large part due to their early dominance of the Atlantic. After eliminating the Tuareg in Africa, the Vandals ravaged the east coast of the Americas, settling the Caribbean and Greenland, taking the capital of Palmares, and crippling New Netherland, while advancing on a different front in Europe, capturing Madrid by episode 10. Fueling them throughout this period was a hilarious bug which gave them over 100 trade routes, although whether this bug significantly influenced their success is debatable. From this point until the end of Cycle 1, the Vandals were consistently tied or outright leading in the contest for who controlled the most capitals. At the height of their American Empire, the Vandals ruled nearly the entire coast from Labrador to Hispaniola to Trinidad and Tobago. However, from about episode 14, the Vandals found themselves on the defensive against the ascendant superpowers of Nigeria and the Marajoara, and they slowly lost land from then until the start of Cycle 2, causing them to fall from the top 10 for several episodes.
With the start of Cycle 2, however, the Vandals once again surprised everyone by doing it all a second time, even without the trade route bug helping them. They gambled early on by using their allotment of unique city-founding horsemen, granted to them at the start of the game, to spam cities throughout the Mediterranean. For an episode or so, this left them with barely any military units, and a well-timed attack could have ended them, but no attack ever came, and the gamble paid off. Now fully in control of the Mediterranean, the Vandals rapidly rose back up the ranks, reaching an all-time high of 2nd place in episode 29, by which time they had approximately recreated the borders of the Roman Empire. Their fall from grace came only at the very end, when a double invasion by the Marajoara and the USSR destroyed everything in one massive campaign. In the end, they finished 11th, just missing the top ten—but they were surely top ten in our hearts.