noun
czar
ZAR/zɑːr/
An emperor of pre-revolutionary Russia.
The museum displays a portrait of Russia's last czar.

Etymology
Caesar became a title of imperial rule, and czar likewise named an emperor. The title then extended to someone with dictatorial powers, underpinning its use for an official with broad authority over a policy area.
In context
for want of a better term the term is czar and but it's actually quite a powerful position
More examples
- Nicholas II was the last czar of Russia.
- The czar's ministers gathered at the palace.
- Several czars expanded Russia's territory during their reigns.
Forms
czar · czars
czarist adjective — Relating to Russia's czars or their rule.