So volume 6 of the Fate/Apo manga came with an official write-up about Avicebron, and while I'm absolutely not translating the whole thing because it's all dry formal academic language and I'll fucking die squinting at all the low-res kanji, I'm going to pull out the key bits. Most of it's pretty standard information, but I think it's good to know what the writers had in mind as "canon."

- Born sometime in late 1021 to early 1022 in Malaga.
- Father was a powerful figure in Cordoba but fled to Malaga due to violence.
- Single child.
- Lost both parents at a young age and had no other relatives.
- Was thankfully protected by Yekutiel ibn Hassan.
- Living in Saragosa, studied the Talmud, philosophy, mathematics, astronomy and other subjects, and was quickly acknowledged as a young genius among the other scholars.
- However, due to his headstrong and cynical nature, he made a lot of enemies and caused some commotion within the Jewish community.
- Started suffering from his illness in his teens, no doubt contributing to his surly personality. The illness caused lesions to appear on his face, arms and legs, and would probably be classified as a skin disease in modern terms.
- When he was 17, Yekutiel was assassinated by an enemy and his lost his comfortable standing in Saragosa.
- In 1045 (~age 24) finally ended up leaving Saragosa.
- After that, never stayed long in one place and drifted between Jewish communities.