Acrisius

Arisius was the former king of Argos, the father of Danaë and grandfather of Perseus.

Percy Jackson's Greek Heroes
Acrisius deeply desired a son to carry on his bloodline on the throne, but only had one daughter. He went to the Oracle of Delphi to know if he will have a son, the oracle informed him that he will never have a son, but his daughter will birth a grandson who will one day kill him. When he returned he had Danaë locked in a bronze cell to prevent her from becoming pregnant with him keeping the only key, however almost a year later he learned his daughter has given birth to a boy fathered by Zeus. He has his daughter and grandson thrown into the sea.

Seventeen years later after Perseus has beheaded Medusa and petrified most of the nobles of Serifos. The son Zeus returns to his homeland and Acrusius flees to a neighboring kingdom where he lived as a beggar.

One day an athletics tournament was being held and he attended. When his grandson was up at the discus throw. He grew fearful and when Perseus threw the discus, a Gus of wind blew it in the king’s direction, killing him. The incident was considered an accident and the son of Zeus was not charged.