Final answer:
Medea enlists the aid of Aegeus, the king of Athens, when she must leave Corinth.
Step-by-step explanation:
When Medea must leave Corinth, she enlists the aid of Aegeus, the king of Athens. In Euripides' play Medea, Aegeus agrees to provide Medea with shelter and protection in Athens in exchange for her help in having children. Medea sees this as an opportunity to escape her dire circumstances in Corinth and start anew.