principate
/ˈprɪnsɪpeɪt/Definitions
1. noun
A system of government in which power is exercised by a chief or first magistrate; a period of rule by a particular emperor.
“The Roman Empire’s principate was marked by relative peace and stability.”
2. noun
The office or position of a chief or first magistrate.
“He held the principate for many years, bringing prosperity to the city.”