Acrisius feared Perseus based on a prophecy that foretold his death by his own grandson.
Acrisius feared Perseus due to a prophecy that stated Acrisius would be killed by his own grandson. The fear stemmed from the belief that Perseus, the son of Danaë, would bring about his demise. Acrisius' efforts to prevent the prophecy led to a series of events including Perseus' heroic feats and eventual fulfillment of the prophecy.
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