Map is credited with being the earliest Medieval writer to mention vampires in his De Nugis Curialium. And, no I am not referring to his stories about Bernard de Clairvaux, I mean real bloodsuckers. St. Bernard was a vegan, when he ate at all.
I confess that this was my main reason for taking De Nugis Curialium out of the library. The vampire stories are in the second division in several stories all titled "Of the Same Apparitions". So what did he say?
The first story concerns a solider named Edric Wilde, a fine Song of Fire and Ice name if I ever heard one. At the local ghildhus where people drink, he spotted a group of beautiful otherworldly women and fell in love with one of them.
"He had heard of the wandering of spirits, and the troops of demons who appear by night, and the sight of them which bringeth death, Dictinna, and bands of dryads and spectral squadrons..... How they preserve themselves undefiled."
Edric did not care. He entered the room, seized the one that he wanted and had his way with her. Then he married her. William the Bastard, who was the king at this time, summoned the two of them to court so that he might see the beauty of this woman with his own eyes.
The day came when Edric was angry that his wife was late and threw it in her face that she spent too much time with her sisters. Whereupon, he no longer had any hold over her and she disappeared but she left the sons that she had with Edric behind. Map warns of the dangers of incubi and sucubi because they do not all turn out to be decent Christians like Edric's sons.
Then Map related a story about a woman who died and was buried but was later discovered by her husband in a field with a band of dancers. Whereupon he immediately snatched her back. She had more children with him after this and those children and their descendants were called 'sons of the dead woman'.
The next story was about a knight and his wife who, every time that they had a baby, found the newborn with its throat cut. A stranger sat up with them on the fourth birth to watch and caught a woman about to do the wicked deed. He held her tight and branded her face with the keys to the local church. The creature flew away weeping and wailing.
So, Renesmee was not so unique after all. Logically, there is no reason why Rosalie could not have a baby after she died since others apparently did. If Edward could get an erection, in spite of not having a pulse and produce viable sperm, then Rosalie should have been fertile also. Map's books contained a few more stories about dead women bearing children besides the few that I mention here.
It is a shame that Meyer's research did not uncover this wealth of vampire lore but then, this is an author who, when Jacob fled to the Canadian north near Alaska, spoke of not knowing which province he was in as he did not pay attention to 'state lines'. There are no state lines in Canada, Stephanie. They are called provinces for a reason. And those 'provinces' in the far north, they are actually called 'territories' not provinces.
Speaking of Jacob, Walter Map did tell a few werewolf stories as well. And so did Boccaccio.