Don't Riddle Me This

Oh Pericles. You're such a wonderfully bizarre play. 

In case you haven't seen Pericles, it starts out with the noble Prince Pericles visiting the kingdom of Antiochus, whose beautiful daughter is up for grabs to whoever can solve a mysterious riddle. Of course, if you get the riddle wrong you die. That's the way these things usually work.

Seriously, Antiochus, that's the best riddle you could come up with? I defy you to write a riddle about an incestuous father-daughter relationship that is more obvious than that.