Adelbert

This man was the sixth person to hold the title of Aub Ehrenfest and Sylvester's father.

Both he and his brother Bonifatius were qualified to become the next archduke, but his brother renounced his claim for the title since he had no desire to lead.

Relatively early in his reign, Aub Ehrenfest suffered a severe illness that left him close to death. To prepare for the worst, Bonifatius was trained to take up the mantle and taught even the secrets that only the Archduke is supposed to know, but to everyone's relief the Aub recovered.

He would later marry his cousin Veronica, and the two had three children together.

The first two were the girls, Georgine and Constanze, the former of which was believed to inherit the title of Archduchess over her little sister. Once the archducal couple gave birth to their son Sylvester, what seemed like a foregone conclusion turned back into a fierce competition. Despite Georgine seeming more skilled and motivated to many, Sylvester's greater mana capacity and gender led his parents to choose him as the successor, leaving Georgine devastated. Georgine had harassed and mistreated her brother since the very beginning, but upon losing the title it only became worse. At one point, their parents started to genuinely fear for Sylvester's safety and thus married Georgine off to Ahrensbach, even though that meant she would only be the third wife to the local Archduke.

Apart from the three children with his first wife, Aub Ehrenfest also had a child with a concubine. This son was Ferdinand. Veronica always had been abusive to anything she perceived as even the most remote threat to her and her direct family, and she harassed and abused even her half-siblings and their children relentlessly, though few felt her fury and paranoia more than Ferdinand. When Aub Ehrenfest's health declined, Veronica's influence and power grew accordingly... as did her abuse, particularly of Ferdinand to the point where Sylvester advised Ferdinand to enter the temple to escape her.

When it became clear that he would not live much longer, Aub Ehrenfest had a final meeting with his son Ferdinand, in which he asked him to promise to protect Ehrenfest and Sylvester. His last words to Ferdinand were "I ask of you, brought to me by the Goddess of Time... protect Sylvester, and protect Ehrenfest."

Aub Ehrenfest succumbed to his illness shortly after and was succeeded by Sylvester, who is now the seventh Aub Ehrenfest.

Due to being a mere blue priest apprentice at the time, Ferdinand was denied a seat of honour at his father's funeral and could only watch from a distance as a priest.