Cepheus (father of Andromeda)

In Greek mythology, Cepheus (Ancient Greek: Κηφεύς Kepheús) was the name of two rulers of Aethiopia, grandfather and grandson.

Family
Cepheus was the son of either Belus, Agenor or Phoenix. If Belus was his father, he had Achiroe, daughter of Nilus, as his mother, and Danaus, Aegyptus, and Phineus as brothers. He was called Iasid Cepheus, pertaining to his Argive ancestry through King Iasus of Argus, father of Io.

Mythology
Cepheus is prominently featured in the Perseus legend as the husband of Cassiopeia, father of Princess Andromeda, and brother of Phineus, who expects to marry Andromeda. Various sources describe his kingdom to be "Aethiopia" or later, the city of Joppa (Jaffa) in Phoenicia, which was named after the elder Cepheus's wife, Iope, daughter of Aeolus.

Cassiopeia boasts that Andromeda is more beautiful than the Nereids, angering both the sea nymphs and Poseidon. In response, Poseidon sends a flood and the sea monster Cetus to attack Aethiopia. Cepheus and Cassiopeia seek guidance from the oracle of Ammon (identified with Zeus) at the oasis of Siwa in the Libyan desert; she declares the calamity will not end until Andromeda is offered to the monster as a human sacrifice. The king chains his daughter to a rock by the shore to be devoured by Cetus at the whim of his subjects.

Andromeda is saved when Perseus, flying home with his trophy head of Medusa, passes by the kingdom of Cepheus and notices a beautiful girl chained to a rock on the shore. Perseus falls in love with her and undertakes to slay the monster if she promises to marry him; in a slightly different version, he approaches Cepheus. The hero then kills the monster (or turns it to stone by showing it the Gorgon’s head). Perseus washes off his blood in a spring near the city of Joppa, which apocryphally turns red as a result.

Cepheus and Cassiopeia allow Perseus to become Andromeda's husband after he uses Medusa's head to turn Phineus and his men to stone for plotting against him. According to Hyginus, the betrothed of Andromeda is named Agenor. After spending a year or so at the court of his father-in-law, Perseus finally sets off for Seriphos with his wife. Since Cepheus has no heir of his own, the departing couple allows him to adopt their first-born child, Perses, who is destined to give his name to the Persians. Cepheus is later made into the constellation Cepheus.