man, the cold water! Thats a good argument to not include by firaxis but I'm making him for fun and as a what-if.
besides the huns are turkic so optionally he can be added there.
Says who?
Research and debate about the Asian ancestral origins of the Huns has been ongoing since the 18th century. For example philologists still debate to this day which ethnonym from Chinese or Persian sources is identical with the Latin Hunni or the Greek Chounnoi as evidence of the Huns' identity.
The most recent genetic and ethnogenesis based scholarship shows that many of the great confederations of steppe warriors were not entirely of the same race, but rather tended to be ethnic mixtures of Eurasian clans. In addition, many clans may have claimed to be Huns simply based on the prestige and fame of the name, or it was attributed to them by outsiders describing their common characteristics, believed place of origin, or reputation. Similarly, Greek or Latin chroniclers may have used "Huns" in a more general sense, to describe social or ethnic characteristics, believed place of origin, or reputation. All we can say safely, is that the name Huns, in late antiquity, described prestigious ruling groups of steppe warriors.
Heck, the Hunnic Empire doesn't even really include any Turkish territory...
The Hun invasions were a very important time in history... I'm not debating they don't deserve some sort of nod in Civilization... I'm just saying, it's really hard to pin them down to a race, a group of cities, even a culture... they are almost the epitome of the true "Barbarian".
If I were to use Atilla for instance, I'd love to make a Hunnic Empire... it would just be a little hard to come up with all the things that normally go into a new civ in Civ4 (plus the whole "what do you do with them in the modern age" thing!
