This isn't a very big bug (and maybe just a feature I don't understand), but thought I should report it just in case.
I started a new game, and made a custom sovereign. I did no ther customization other than setting the difficulty to challenging (random opponents). Once in game, I ran into an enemy civ right away using the sovereign that I'm using, that I just created for this game. We both had the same name and everything, he killed me, since he had found a better weapon, and all other factors were identical. Took the wind right out of my sails.