Answer: a small group wealthy citizens or warriors citizens controlled the government.
Step-by-step explanation:
An Oligarchy in business refers to an industry that is controlled by few firms. This is the same when an Oligarchy is the system of government. It means few people control the government.
Sparta was one such government. They had a monarchy which consisted of two kings. They also had an oligarchy as the government was controlled by Apella and the Gerousia which both included a few wealthy citizens and warrior citizens.