Alectryon in Wikipedia

Alectryon (Greek: άλεκτρυών) is the Ancient Greek word for "rooster". In Greek mythology, Alectryon was a youth, charged by Ares to stand guard outside his door while the god indulged in illicit love with Aphrodite. He fell asleep, and Helios, the sun, walked in on the couple. Ares turned Alectryon into a rooster, which never forgets to announce the arrival of the sun in the morning. - Wikipedia