"To theologians and philosophers, it is a fact, that from the copulation of humans (man or woman) with the demon, human beings are sometimes born. It is by this process that Antichrist must be born, according to a number of doctors: Bellarmin, Suarez, Maluenda, etc.

[Le Brun's comment throws more light: 'If the body of these children is thus different from the bodies of other children, their soul will certainly have qualities that will not be common to others: that is why Cardinal Bellarmin thinks Antichrist will be born of a woman having had intercourse with an incubus.']

"Besides, they observe that as the result of a quite natural cause, the children generated in this manner by the incubi are tall, very strong, very daring, very magnificent and very wicked...

Maluenda confirms what has been said above, proving by the testimony of various classical authors that it is to such unions that the following owe their birth:

"Romulus and Remus, according to Livy and Plutarch.

"Servius-Tullius, sixth king of the Romans, according to Denys of Halicarnassus and Pliny.

"Plato the philosopher, according to Diogenes Laertius and St. Jerome.

"Alexander the Great, according to Plutarch and Quinte-Curce.

"Seleucus, King of Syria, according to Justin and Applian.

"Scipio the African, according to Livy.

"The Emperor Caesar Augustus, according to Suetonius.

"Aristomenes of Messenia, the illustrious Greek general, according to Strabo and Pausanias.

"Let us add the English Merlin or Melchin, born of an incubus and a nun, the daughter of Charlemagne.

"And finally, as writes Cocleus, quoted by Maluenda, that damned heresiarch whose name is Martin Luther.

However, in spite of all the respect I owe so many great doctors, I do not see how their opinion can stand examination. Indeed, as Percrius observes very well in Commentary on Genesis, Chapter Six, all the strength, all the power of the human sperm, comes from spirits that evaporate and vanish as soon as they issue from the genital cavities where they were warmly stored. The physicians agree on this. Therefore, it is not possible for the demon to keep the sperm he has received in a sufficient state of integrity to produce generation; for, no matter what the vessel where he could attempt to keep it is, this vessel would have to have a temperature equal to the natural temperature of human genital organs, which is found nowhere but in those same organs. Now, in a vessel where the warmth is not natural, but artificial, spirits are resolved, and no generation is possible. A second objection is that generation is a vital act through which man, from his own substance, introduces sperm through the use of natural organs, into a place proper for generation. To the contrary, in the special case we are now considering, the introduction of the sperm cannot be a vital act of the generating man, since it is not by him that it is introduced into the matrix. And, for the same reason, it cannot be said that the man to whom the sperm belonged has engendered the fetus that is procreated. Neither can we consider the incubus as the father, since the sperm is not of his own substance. Thus here is a child who is born and has no father -- which is absurd. Third objection: when the father engenders naturally, there is a concourse of two causalities: a material one, for he provides the sperm that is the material of generation; and an efficient one, for be is the main agent in the generation, according to the common opinion of philosophers. But, in our case, the man who does nothing but provide the sperm simply gives material, without any action tending toward generation. Therefore be could not be regarded as the child's father, and this is contrary to the notion that the child engendered by an incubus is not his child, but the child of the man whose sperm was borrowed by the incubus....

We also read in the Scriptures (Genesis 6:4) that giants were born as a result of intercourse between the sons of God and the daughters of Man: this is the very letter of the sacred text. Now, these giants were men of tall stature, as it is said in Baruch 3:26, and far superior to other men. Besides their monstrous size, they called attention by their strength, their plunders, their tyranny. And it is to the crimes of these giants that we must attribute the main and primary cause of the Flood, according to Cornelius a Lapide in his Commentary on Genesis.

Some state that under the name of sons of God we must understand the sons of Seth, and, under that of daughters of men, the daughters of Cain, because the former practiced piety, religion, and all other virtues while the latter, the children of Cain, did exactly the opposite. But, with all the respect we owe Chrysostom, Cyril, and others who share this view, it will be recognized it is in disagreement with the obvious meaning of the text. What do the Scriptures say? That from the conjunction of the above were born men of monstrous corporeal proportions. Therefore, these giants did not exist previously, and if their birth was the result of that union, it is not admissible to attribute it to the intercourse between the sons of Seth and the daughters of Cain who, of ordinary size themselves, could have children only of ordinary size.

Consequently, if the intercourse in question has given birth to beings of monstrous proportions, we must see there not the ordinary intercourse of men with women but the operation of the incubi who, owing to their nature, can very well be called sons of God. This opinion is that of the Platonist philosophers and of Francois George of Venice, and it is not in contradiction with that of Josephus the historian, Philo, St. Justin Martyr, Clement of Alexandria, and Tertullian, according to whom these incubi could be angels who had allowed themselves to commit the sin of luxury with women. Indeed, as we shall show, there is nothing there but a single opinion under a double appearance.

What we have here is a complete theory of contact between our race and another race, non-human, different in physical nature, but biologically compatible with us. Angels, demons, fairies, creatures from heaven, hell, or Magonia: they inspire our strangest dreams, shape our destinies, steal our desires.......

But who are they?

Excerpt from:
Passport to Magonia
On UFOs, Folklore and Parallel Worlds
1969 by Jacques Vallee
ISBN 0-8092-3796-2