Erzsebet met the Incubus Balthazar when she was 19, trapped in a loveless marriage with a man who constantly had other women. Balthazar intrigued her, but she felt like her attraction to him was sinful, so she tried to stay away from him.
When she was attacked in an alley, Balthazar saved her, and she gave into her feelings for him. They became lovers, and he told her what he is, an Incubus. She wanted him to give her a child, but he refused. Erzsebet ended things with Balthazar then since he wouldn't give her what she wanted. She vowed to have a vampire child or she'd die trying.
She eventually found Gaius, an Incubus that looked like Balthazar but he had purple eyes. He agreed to the arrangement, and slept with her. She then discovered she was also already pregnant with a human baby from her stupid loser husband, and sought council from the vampires so they could help her keep both babies. She had to drink human blood until delivery, which started the rumors about her and blood.
Balthazar witnessed the birth of her two babies, and she expressed remorse over the way their relationship ended, but not regret over having the babies. She had Anastasia, a vampire, and Clara, an immortal human. The two continued to see each other as friends for many years as her daughters grew up.
Anastasia's mate was killed, and she started a war to get her revenge for his death. Erzsebet could not see past her love, and allowed Anastasia to do whatever she wanted, putting Erzsebet at risk with her bloodlust.
Ana became with child after a night with Clara's lover, and Erzsebet knew their family would be the child's death. After years apart, Erzsebet summoned Balthazar to carry her newborn vampire granddaughter, Elisabeth, to the vampires to be raised in secret, and made him swear he will never tell the girl who her family is.
Humans eventually discovered the bodies Anastasia was creating with her bloodlust, and Erzsebet took the fall for her daughter, claiming they were hers. She was imprisoned into a tower of her castle, and Balthazar returned, spending the last few years of her life with her.
She knew after all this time that his devotion was real, but hers had never been that deep. She hoped he would find someone else who would treat him the way he deserved. In her dying moments, she made him promise to take care of her granddaughter.