Jean Bodin
Many Christian theologians (Martin Luther and Jean Bodin among others) believed that demons could impregnate women but their children would have a short life and be good for nothing; other theologians (Francisco Valesio, aka Valesius, Tomaso Malvenda and Johann Cochlaeus among others) thought that these children could be important characters, like Attila, Martin Luther, Melusine or the Antichrist.