Western culture has been shaped largely by the Bible. In attempting to understand the Scriptures, scholars of the last three hundred years have intensively studied both these sacred texts and other related ancient writings. A cursory examination reveals that their authors depended on other sources, some of which are lost and some of which have recently come to light. Part of these extant sources are the pseudepigrapha. Though the meaning of the word can be disputed by scholars, The Old Testament Pseudepigrapha is a collection of those writings which are, for the most part, Jewish or Christian and are often attributed to ideal figures in Israel's past. Volume 1 of this work contains two sections. The first is Apocalyptic Literature and Related Works. An apocalypse, from the Greek meaning revelation or disclosure, is a certain type of literature which was a special feature of religions in late antiquity. In the past, the definition was derived from the study of only some of the extant apocalypses, especially the Apocalypse, the Book of Revelation. This has changed and the present edition of the pseudepigrapha includes nineteen documents that are apocalypses or related literature. It will now be easier to perceive the richness of apocalyptic literature and the extent of early Jewish and Christian apocalyptic ideas and apocalyptic religion.