Io is the daughter of Inachus, a River God, and Argia/Melia. By
others she is called a daughter of Iasus or Peiren.
Regardless, she was loved by Zeus and turned into a white heifer
by him, she was then gaurded by the hundred-eyed giant Argus, who
was killed by Hermes, she was then plagued by a gad-fly to torment
or drive her mad - she traveled until she reached Egypt and became
there the goddess Isis, her children were Epapus, Iasus, and
Ceroessa.
Epaphus married Memphis or Cassiopeia and had Libya, Lycianassa
and Dorus. With Poseidon, Ceroessa had Byzas.