What is "hippeis"

Hippeis (, singular ἱππεύς, hippeus) is a Greek term for cavalry. In ancient Athenian society, after the political reforms of Solon, the hippeus was the second highest of the four social classes. It was composed of men who had at least 300 medimnoi (or their equivalent) as yearly income. This would give them the ability to purchase and maintain a war horse during their service to the state.

Its counterparts were the Roman Equestrians and medieval knights.