autocrator

The story

1. Proto-Indo-European*h₂ew
2. Proto-Indo-European*tó-
3. Proto-Hellenic*autós
4. Proto-Indo-European*h₂ew
5. Ancient Greekαὖ (aû)
6. Ancient Greekτόν (tón)
7. Ancient Greekαὐτός (autós)
8. Ancient Greekαὐτο- (auto-)
9. Proto-Indo-European*kret-
10. Ancient Greekκράτος (krátos)
11. Ancient Greekκρᾰτέω (krătéō)
12. Ancient Greekκρᾰ́τωρ (krắtōr)
13. Ancient Greekαὐτοκρᾰ́τωρ (autokrắtōr)
14. Late Latinautocratōr
15. English todayautocrator

From Late Latin autocratōr, from Ancient Greek αὐτοκράτωρ (autokrátōr, “emperor”).