For centuries, trading caravans made epic journeys across the Saharan sands to reach the markets of the legendary city of Timbuktu, where they traded salt, gold, slaves, textiles?and books. By the mid-fifteenth century, Timbuktu had become a major center of Islamic literary culture and scholarship. The city's libraries were repositories of all the world's learning, housing not only works by Arab and Islamic writers but also volumes from the classical Greek and Roman worlds and studies by contemporary scholars.