Perseus
Greek mythological hero, son of Zeus and Danae. In Cyril's chronology, killed Dionysus 290 years after Moses.
Preface and Praise of Sacred Scripture
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Praises of Moses from Scripture and the Fathers
— In 290th year after Moses, killed Dionysus (Liber); tomb at Delphi near golden Apollo
"Perseus killed Dionysius, that is Liber"