In Greek mythology, Demophon was a veteran of the Trojan War and king of Athens. The son of Theseus and Phaedra, Demophon was raised in exile by a family friend after his father was deposed. He later fought in the Trojan War, being one of those who hid in the Trojan Horse. Following the fall of Troy and the rescue of his grandmother Aethra, Demophon is said to have landed in Thrace on his return journey, where he met and married Phyllis, the daughter of the king. Leaving for Athens, Demophon promised to return, and when he did not, Phyllis committed suicide in despair. Arriving in Athens after a possible stop in Cyprus, Demophon succeeded Menestheus as king of Athens, supposedly in 1183 B.C. As king, he gave refuge and land to the Heracleidae in Athens, fought Diomedes and wrested the Palladium from him, presided over the creation of the court of the Ephetae, and hosted Orestes during his madness. Demophon died in Athens in 1150 B.C. after a reign of 33 years, and was succeeded by his son Oxyntes.

Theseus was a divine hero and the founder of Athens from Greek mythology. The myths surrounding Theseus, his journeys, exploits, and friends, have provided material for storytelling throughout the ages.