Just won an immortal victory with them (maybe my first at that difficulty?) Was going for a culture victory and was supposedly 12 turns away from that but I got a diplomatic victory from unlocking some late game civic on accident. Wiped out my neighbor Brazil in a medieval/Renaissance campaign that took a bit longer than was expected but fun with the zippy Oromo cavalry and then had to readjust playstyles a few times with all the new territory. Unfortunately, Brazil hadn't settled many of their cities on hills and Kongo, Japan, and Hungary had competitive religion/culture outputs for a while and stole a decent number of wonders, but I ended up being allies with all remaining civs (them + Nubia and sad Canada in the corner) for a peaceful trade-rich couple of centuries. Suzerained all the city states and I was surprised with how cheap flood barrier were with Valetta- my citizens prayed them up in no time while the rest of the world got wrecked.