Hermas, Shepherd of (herˈməs) [key], Christian apocalyptic work, composed in Rome c.A.D. 139–A.D. 155. It is a collection of revelations given to Hermas, a devout Christian, by an angel (Shepherd) and is divided into three sections: Visions, Mandates, and Similitudes. The teachings are concerned mostly with matters of penance, morals, and the condition of the church; they were highly regarded by early Christians. The book is extant in fragments of the original Greek and in complete Latin and Ethiopic texts. It has been published in English translation in collections of patristic literature.