Danaë

Titian, Danaë Receiving the Golden Rain, 1560-1565, oil on canvas, 129 x 180 cm, Museo del Prado, Madrid

Danaë was the daughter of a king, and a prophecy foretold that her son would kill him.  Her father thus had her locked in a chamber, but she was impregnated by Zeus/Jupiter, in the form of golden rain.  She gave birth to Perseus, who later went on to kill his grandfather (though by accident).