Mystery of the Crown of Aleppo

Sometime in the 10^th century, in Tiberias, Aharon ben Asher and Shlomo ben Buya'a sat down to produce an annotated copy of the Hebrew Bible. Ben Buya'a was responsible for the lettering, while Ben Asher, whose father, Moshe, was also a great master of the textual tradition, or Masorete (from the Hebrew mesorah, meaning tradition), added the notes. These notes are what made the so-called "Aleppo Codex" (a codex is an ancient book rather than a scroll), or, in Hebrew, Keter Aram Tsova (Crown of Aleppo) the most authoritative Hebrew Bible of the Middle Ages. In fact, ben Asher and ben Buya'a's text didn't reach Aleppo until the 15^th century, and the question of how it got there is one of the several historical mysteries discussed in Hayim Tawil and Bernard Schneider's new book.