Hermias of Atarneus

Hermias of Atarneus (; ; died 341/0 BC) and Aristotle's father-in-law.

The first mention of Hermias is as a slave to Eubulus, a Bithynian banker who ruled Atarneus. Hermias eventually won his freedom and inherited the rule of Atarneus. Due to his policies, his control expanded to other neighbouring cities, such as Assos, in Asia Minor.

In his youth, Hermias had studied philosophy in Plato's Academy. There he first met Aristotle. After Plato's death in 347 BC, Xenocrates and Aristotle travelled to Assos under the patronage of Hermias. Aristotle founded his first philosophical school there and eventually married Pythias, Hermias' daughter or niece.

Hermias' towns were among those that revolted against Persian rule. In 341/0 BC, the Persian King, Artaxerxes III, sent Memnon of Rhodes to reconquer these coastal cities.