In this diploma thesis, we examined the use of premonition signs in ?The Twelve Caesars? by Suetonius, with special attention to the following categories: dreams, unusual natural phenomena,extispicy,haruspicy, lightning strikes, star constellations, discovery of artefacts, observations, and oracle. Interesting concentrations of premonition signs can be established at the birth of the (future) sovereigns, before their takeover of sovereignty, their death, or prior to important, meaningful political or military events. The acknowledgment of signs along this timeline provides the structure to this paper. The following findings have been derived from the investigation: Premonition signs are mainly brought into play dealing with political themes and as stylistic tools. When examining this in detail, we recognise a specific purpose: Portents and presages stress and emphasize the legitimacy of the Caesar's sovereignty and dominion, and in ?The Twelve Caesars? this is clearly done by means of a careful choice of when and where to place them. Premonitions are thought to reveal that the ruler has been designated by divine election and that the Caesar thus enjoys divine protection.Additionally they are used to define and codify topoi, to veil criticism and to portray the Caesar. Furthermore premonition signs can be useful to accomplish the imitatioAlexandri.Used asa stylistic tool, they have an educational function, a sort of "forewarning" sign on the way to disaster. Premonitions can be used as inner textual parentheses, they can reveal a certain quality of humour; and finally - through use of similar images - characterize specific Caesars or dynasties.In his work Suetonius can (and certainly does) use an almost inexhaustible collection of well known and already clearly interpreted images.