Edwin Sidney Hartland 
The legend of Perseus, Volume I 
The supernatural birth

In The Earthly Paradise William Morris has made English the Doom of King Acrisius in such lovely wise, and in the main with such close adherence to the story as told by Ovid and other classical writers, as to render thankless the task of repeating it at length. But in undertaking an inquiry into the foundations and history of the legend of Perseus, it is needful to bear in mind its salient features. I shall therefore ask the reader’s patience for a summary of these.

Acrisius, the son of Abas and king of Argos, having been warned by an oracle that he should die by the hands of his daughter Danae’s son, built a tower of brass in which he imprisoned the maiden, that he might keep her celibate and so frustrate the oracle. Jupiter, however, visited her in a shower of gold; and she bore a son, Perseus.