Page from the Aleppo Codex. The Aleppo Codex (Crown of Aleppo) is a medieval bound manuscript of the Hebrew Bible. The codex was written in the city of Tiberias in the 10th century CE (circa 920) under the rule of the Abbasid Caliphate, and was endorsed for its accuracy by Maimonides. Together with the Leningrad Codex, it contains the Ben-Asher masoretic tradition. The codex was kept for five centuries in the Central Synagogue of Aleppo, until the synagogue was torched during anti-Jewish riots in 1947. The fate of the codex during the subsequent decade is unclear: when it resurfaced in Israel in 1958, roughly 40% of the manuscript, including the majority of the Torah section, was missing, and only two additional leaves have been recovered since then. The original supposition that the missing pages were destroyed in the synagogue fire has increasingly been challenged, fuelling speculation that they survive in private hands. The portion of the codex that is accounted for is housed in the Shrine of the Book at the Israel Museum.