Behold the Tocharian Empire of Turan!
Charlemagne start, all main DLC (except Sunset Invasion), no mods.
Started as a two-provinces Tocharian Buddhist Count, I swore fealty to the Kashgar (later Kasake) Duchy, then I got promoted to Duke after the previous one died in an "accident".
Then I conquered the Khotan Duchy and got enough provinces to form the Khotan Kingdom (or Ytarimypoy, as called by Tocharians). Meanwhile I became a Chinese Tributary, which helped me to at least not being attacked by China and earning Grace for Strategists and Engineers (and some Imperial Marriages)
I waged war to the nomads to get territories from Transoxania and Zhetysu (having many daughters to marry, even if they were bastards, helped a lot for making alliance with other kingdoms). I also used the Grace I stocked to call a few Chinese Invasions to destroy Tibet, which became too dangerous for my plans.
Then when I finally formed the empire, almost all my neighbors converted to Hindu, making impossible for me to call Holy War CBs. So, due to Khotan being a Bon holy site, I converted to Bon and reformed it around 1200 AD, reviving a religion which in game was pratically annihilated at that point. I also stopped to be a Chinese tributary and after a few GHW I conquered many territories from the Indian region.
I also created two level 4 Great Works (Fortress and University), two level 3 GW (Library and Garden) and other two level 2 GW (Royal Palace and Undergroud City)
View attachment 592171