Tacitus and Sima Qian (ca. 140-85 BC, author of the Shiji, the Records of the Historian) are eminent representatives of Roman and ancient Chinese historiography. The starting-point of the paper is a striking parallel between the two historians: During the reign of autocratic emperors (of the last of the Flavian emperors, Domitian, and of the most powerful of the Han-emperors Wudi) both authors undergo experiences which not only affect them on a personal level, but also influence their historiographie practice. The paper traces this influence with respect to the representations of individual historical characters. On the one hand it analyses the representations of rulers: of Tiberius, adoptive son and successor of Augustus, and of Wendi, natural son and (indirect) successor of Gaodi, the founder of the Han-dynasty; on the other hand it studies the representations of second and third rank characters such as senators, ministers, generals, and - in the case of Sima Qian - also of people from other walks of life. The similarities which can be observed between the two authors point to the existence of certain anthropological constants, whereas the differences are to be attributed to basic differences in Roman and Chinese political thinking and to differing degrees of the intensity of the experiences undergone by each historian.