I either choose that claim that I previously mentioned. It'd be the equivalent of Italy in many ways. Except united.
Another idea I am thinking of is Mongols riding wargs. The only issue is that the main continent seems to be Europe equivalent and there are perhaps not enough landmass to make that style to work. I don't mean I want an area as large as the Mongol Empire was but nomadic lifestyle needs tons of space. So maybe I axe that.