Suetonius describes the lives of Caesars according to categories such as antecedents, birth, career, achievements, morals, religion, appareance, and death. In my paper I examine the function of religion in The Deified Augustus of Suetonius. Firstly I list the places where phenomena concerning religion appear. Then I analyse the attitude of Augustus towards religions; e.g. he took dreams very seriously, and regarded certain auspices and omens as infallible. Suetonius treats the religious beliefs of Augustus long because he regards them as very important. Augustus wanted to enhance the sacred character of his principate, therefore he acquired membership in several priesthoods.