St. Thomas (Summa Theologica I:108), following St. Denis (De Coelesti Hierarchia, vi, vii), divides the angels into three hierarchies each of which contains three orders. Their proximity to the Supreme Being serves as the basis of this division. In the first hierarchy he places the Seraphim, Cherubim, and Thrones; in the second, the Dominations, Virtues, and Powers; in the third, the Principalities, Archangels, and Angels. The only Scriptural names furnished of individual angels are Raphael, Michael, and Gabriel, names which signify their respective attributes. Apocryphal Jewish books, such as the Book of Enoch, supply those of Uriel and Jeremiel, while many are found in other apocryphal sources, like those Milton names in “Paradise Lost”.