He was afraid of this, and, if you allow me the joke, he turned Ἀκρίσιος/Acrisius to his daughter, and put her under the most severe of watches.
Is anyone willing to engage in the worst of social anathemas and – just explain to me what the joke is supposed to be? Is it a pun of some sort that I am missing, or is just a bad-taste comment remarking on the fact that he behaved towards his daughter in more or less the same fashion as Danae’s father Acrisius did to his?
“Joke” is probably not quite the right word. He’s just being less than wholly serious.
“He became an Acrisius to his daughter.” The Greek Acrisius-Danae-Perseus myth bears a resemblance to the Seuchorus-Gilgamos story: an oracle tells a king (Seuchorus/Acrisius) that his daughter’s son (Gilgamos/Perseus) will displace him from the kingdom; he guards the daughter carefully to prevent her from getting pregnant, but pregnant she gets nonetheless and gives birth to a son; measures are taken to kill the son, but he is rescued and eventually displaces his grandfather. (Of course variations on this pattern occur again and again in the mythologies of many peoples–Oedipus, for example).
In Gilgamos’ case, the baby boy was rescued by an eagle who carried him off when he was thrown from the citadel and raised him as her own. Aelian apparently relates this story as an example of “philanthropy” – love of a human – by an animal.
But he tells it somewhat humorously (“the oracle was smarter than the Babylonian king”), and he wryly adds that if anyone thinks this is just a myth, he agrees: he hasn’t been able to verify it. So he’s telling this whole story tongue in cheek. Perhaps when he brings in the analogy to Acrisius, a myth that probably no one likely to read Aelian really believed in his day, he’s signaling that he’s not really serious.
To be honest, though I knew the Perseus myth, I have to confess I didn’t know who Acrisius was – father of Danaë and grandfather of Perseus – until I looked him up in Wikipedia:
Maybe it shows my low humor, but I thought that it was (mildly) funny way to say that these are really the same myth with the names changed. It’s the basic tenet of comparative mythology. He became (acted like) Acrisius to his daughter. And as the stories changed time and place, he really did become Acrisius.