This collection presents new research in angelology, giving special attention to the otherworldly beings known as the Watchers who are able to move between heaven and earth. According to the pseudepigraphic Book of the Watchers (1 Enoch 1-36), these angels descend to mate with women. The collection begins by examining Watchers traditions in biblical and non-biblical writings (e.g., Gen 6:1-4, the Qumran Hodayot, Book of Jubilees, and Book of Revelation). The collection also surveys Watchers traditions among late antique writings, including the Apocryphon of John, Manichean and Islamic writings, testamentary literature, the Pseudo-Clementines, and medieval Scholastic texts.