Dreaming up Sevia (Differences)

To create the backstory for the conflict that's one of the major themes in this series, I speculated, as creative writers love to do.
What if...a Genghis Khan-type warlord carried his conquest far out of Central Asia and into Southeastern Europe? What if he and his descendants ruled the Slavic people there for a few generations and then, after his empire was overthrown, the conquerors faded into legend?
Except they didn't disappear without a trace. They left this obscure corner of a forgotten empire with a legacy of a non-Slavic language and traditions, and descendants with hints of Central Asia rather than Europe in their physical features. These are the people now known as the Tur. They remain at odds with the Slavic "Sevian" majority to this day.