In Greek mythology, Acrisius was a king of Argos, twin brother of Proetus, and grandfather of the hero Perseus through his daughter Danaë. An oracle warned that Danaë's son would kill him; his attempts to thwart the prophecy ended when Perseus accidentally struck him with a discus at Larissa.
Adapted from Wikipedia, "Acrisius" · CC BY-SA 4.0
I.Family and Argive kingship
Acrisius was son of Abas and twin of Proetus, in the line of Lynceus and Aegyptus. He married Eurydice or Aganippe; their daughter Danaë became mother of Perseus. Some authors also name a daughter Evarete, wife of Oenomaus of Pisa.
The twins were said to have quarrelled even in the womb. After Abas' death Acrisius expelled Proetus, who returned with Lycian help; the kingdom was then divided, Acrisius keeping Argos and Proetus taking Tiryns and the coast.
II.Danaë, Perseus, and the prophecy
Childless of sons, Acrisius consulted Delphi and learned he would die by his daughter's child. He locked Danaë in a bronze chamber; Zeus visited her as a golden shower (some tellings blame Proetus) and she bore Perseus. Acrisius cast mother and infant to sea in a chest; they washed ashore on Seriphos and were rescued by Dictys.
Years later Perseus, having slain Medusa and won Andromeda, came to Larissa for games. His discus struck Acrisius and killed him, fulfilling the oracle. A separate antiquarian tradition makes Acrisius founder or first regulator of the Delphic amphictyony.