I believe it was ruled by a small number of emperors. so kinda, ya.
It is called oligarchy.
An aristocracy government was ruled by one King/Queen, an oligarchy government was ruled by the few.
an oligarchy is ruled by an elite group; an absolute monarchy is ruled by a single individual.
Oligarchy
oligarchy
It was ruled only by a selected few, called an oligarchy
An oligarchy is not run by one person. An oligarchy is a group of people leading a place
From 1185 to 1203, the Byzantine Empire was ruled by Alexios IV Angelos.
Oligarchy
Oligarchy
Sparta.
See Oligarchy