"the iron island" as they used to call it, was inhabited
by the powered giants called Cyclops. The tremendous
Cyclops lived in a cave near Psaropyrgos and the
construction of huge walls all over the island - whose
remains are said to be the walls of Liomandra and
White Tower - is attributed to them. Cyclops, the children
of Poseidon, were the first to exploit the mineral wealth of
the island and to create an early civilization, which they
later bequeathed to people.
There is also another legend for which Serifos is known.
Arkisios, the king of Argos, having received an oracle that said that his grandson would kill him, decided to imprison his daughter Danae so as not to give birth to any child. Unfortunately, Zeus fell in love with Danae, changed himself into rain seduced her and she gave birth to Perseus. When Arkisios found out, he locked Danae and her son in a box and threw them into the sea. The box arrived in Serifos and mother and son were given shelter by the king’s brother, Diktis. When the king, Polydefkis, met Danae he fell in love with her. For fear
that Perseus might prevent him from seducing her, he sent him to kill Medusa – the mortal sister of the immortal mermaids – who was able to petrify whoever dared to look her in the eyes.
Perseus succeeded in killing Medusa with the help of the gods’ weapons and mainly with Athena’s shield which he used as a mirror to avoid looking directly into the monster’s eyes. He returned to Serifos demonstrating Medusa’s head that petrified Polydefkis and his peers. According to the legend this is why the island is so rocky. The fact that the first kings of the island were Diktis and Polydefkis, sons of Magnetos and grandsons of Aeolus, suggests that the first inhabitants of the island were Aeolians.