Polydectes

Polydectes was the king of Serefos.

Percy Jackson's Greek Heroes
When his brother brought Danaë and Perseus to him, be desided marry the princess of Argos to become king of both kingdoms. He had Perseus sent to the temple of Athena while Danaë stayed at his palace. He allowed visitations between mother also tried to seduce the princess to no success.

Seventeen years later he sent the son of Zeus on a suicide mission to kill Medusa and give him her head. While he is away he forces Danaë to marry him. However Perseus returns with the head and petrifies him.