|“||When we attended the Convention of Thorns, our clan divided into a roughly 50/50 split. The true maniacs, those who lost control over their temperament and connection to humanity, of course drifted. But where did they drift? The Camarilla... Sabbat drove the sane insane and Camarilla acted as nepenthe to the madness.||”|
|— Jacob in a letter to Therese Voerman|
|“||Don't mistake candor for weakness, my lad. I've spent a millennium playing with an open hand. Esau plays with his closed. He denies the Jyhad exists. We're both still extant, both still dogging one another. Jerusalem, Athens, Tunis, Milwaukee. Once we've done the full circuit and get back to Jerusalem, we might shake and make up.||”|
In modern nights, he spends most of his unlife in a house on the border of the Kindred-dominated region in the suburb of Greensdale, Wisconsin. His madness subtly but undeniably permeates his domain. As a childe of Abd ar-Rahman, he has a Middle Eastern look and actually thinks he is both the biblical Jacob as well as his brother and archenemy, Esau; both are personalities he created when he was Embraced. The two have waged a war lasting at least a thousand years, unaware that one is a personality of the other. Jacob/Esau denies the Jyhad's existence to stress the profanity of undead existence.
Milwaukee by Night has listed Jacob's childe (Jason) as a member of the 7th generation. But, since Jacob himself is described as a 5th generation vampire, that would mean that Jacob has committed diablerie after Jason's Embrace, thus lowering his own generation at some point after the year of 1903. This information is contradicted by the Encyclopaedia Vampirica, that says Jason is actually a 6th generation vampire. It should be noted, however, that Encyclopaedia Vampirica is a book written in character, and has been widely known as an unreliable source of information. But then again, there's also the possibility that the authors of Milwaukee by Night have simply made a mistake regarding Jason's generation, and that Encyclopaedia Vampirica has corrected that mistake.
- In Beckett's Jyhad Diary it is heavily implied that Jacob/Esau is the sire of Therese/Jeanette Voerman. He claims he Embraced one while Esau Embraced the other sister: it is unclear based on his statement, but likely that Therese was Embraced by Jacob and Jeanette by Esau.