The Cairo Geniza, alternatively spelled Genizah, is a collection of some 400,000 Jewish manuscript fragments and Fatimid administrative documents that were kept in the genizah or storeroom of the Ben Ezra Synagogue in Fustat or Old Cairo, Egypt. These manuscripts outline a 1,000-year continuum of Jewish Middle-Eastern and North African history and comprise the largest and most diverse collection of medieval manuscripts in the world. Wikipedia