The Empire of Songhai in 1500. Macina, Bonoman, and Kano are my vassals. Macina will be integrated come July 1500. This started out as a Nobody Wants To Die achievement run, which finally succeeded, and then I thought I was on a roll and decided to keep on rolling.
What's most hindered me so far is the fact that I had my king die without an heir, switching me to another dynasty and pretty low legitimacy. And then he died very quickly, leaving me with even lower legitimacy (something like 20). I'm building up very slowly, but the current king (a 4/5/4, so not too bad) has been around for 43 years. All this low legitimacy set off the counter towards Civil War (currently at 97.5%), which will only end when I get 75 legitimacy or a regency council. So I end up eating single provinces in my wars and just vassalizing everyone because even 10% overextention will start that timer up again.