Warlow, as stated in the Book of the Vampyr, is one of the progenies of Lilith herself. He outlived his maker by over 5,000 years, and was active in some form well into the Common Era. His name is known to those who have studied the Book of Lilith, but he remains a somewhat mysterious figure even to Lilith's most ardent followers.
Thousands of years ago, when the fae still lived openly on Earth and the human and vampire races were young, Warlow was a faerie prince living in the same village as Niall Brigant. One evening, Warlow left the village to collect water from a nearby stream, where he encountered a beautiful woman, dark as the night, who could move at astonishing speed. Lilith turned him, saying that God had sent him to her for a higher purpose. ("F**k the Pain Away")
Four years later, a homesick Warlow returned to the village (against her advice), where he slaughtered the entire village after losing control of his vampire side. He managed to spare Niall; although he had only been recently turned and reduced his own parents to dust, Warlow "couldn't bear to kill a child." ("At Last") A distraught Warlow returned to Lilith and destroyed her cave with photokinesis, forcing her to meet the sun. He then turned his back on the vampire race. ("F**k the Pain Away")
Millennia later, Warlow located one of Niall's sons and got him to sign a contract promising the next fae-bearing female Stackhouse to him. Warlow lost the Stackhouses' trail for several centuries until the night he killed Sookie and Jason's parents, at which point Claudine was able to successfully banish him from this plane. However, the ritual that Sookie and Claude performed 20 year later gave Warlow a beacon to follow, and he was able to return.("The Sun")