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La présente thèse étudie à la fois les réalités de la présence chrétienne en Mésopotamie ainsi que l’image que les chrétiens se sont données d’eux-mêmes. Installé sur les rives du Tigre et de l’Euphrate, le christianisme de l’empire perse s’est diffusé à l’ombre d’un pouvoir non chrétien, comme dans l’empire romain. Toutefois les destinées des deux christianismes, celui d’Occident et celui d’Orient, se sont séparées lorsque l’empire romain est devenu chrétien. Les chrétiens de la Mésopotamie sassanide ont dû alors osciller entre l’hostilité franche du pouvoir et les périodes de tolérance jusqu’à la chute de la dynastie au milieu du VIIe siècle. Le christianisme mésopotamien fut caractérisé par une forme de diversité à la fois linguistique et religieuse, marqué par la porosité avec les autres groupes, contre laquelle les autorités religieuses n’ont cessé de délimiter des frontières claires. Il s’est progressivement étendu à l’ensemble des couches de la société sassanide, jusqu’aux élites dirigeantes, et jusqu’aux campagnes. Alors, une production littéraire et historiographique d’ampleur a contribué à la formation d’un portrait cohérent et linéaire dans la documentation syro-orientale dominante, issue de l’Église de l’Est. Ailleurs, des mémoires divergentes des chrétiens de Perse nous sont parvenues. / This dissertation looks at both the realities of the Christian presence in Mesopotamia and how the Christians constructed their own image. Established on the Tigris and Euphrates rivers, Christianity during the Persian Empire it developed under a shadowy non-Christian power, as with the case with the Roman Empire. However, the fate of Western and Eastern Christianities diverged when the Roman Empire became Christian. In Sasanian Mesopotamia, the treatment of Christians wavered between direct hostility from Zoroastrian power and periods of tolerance, until the fall of the dynasty in the middle of the 7th century. A form of linguistic and religious diversity characterized Mesopotamian Christianity. The lines between Christians and the other communities were narrow, which caused religious authorities to draw clear boundaries between Christians and non-Christians. Christianity expanded into the whole Sasanian society, including the peasantry and ruling elites. Therefore, after the 5th century, there was a large proliferation of East-Syrian literature and historiography, which had a key role in the development of the dominant Christian image within the Church of Persia. However, other literary traditions passed down different views of the Christians of Sasanian Mesopotamia.

This thesis aims to consider the competing visions of Sasanian Iran advanced by Arthur Christensen in ‘L'Iran sous les Sassanides' (1944) and Parvaneh Pourshariati in ‘Decline and Fall of the Sasanian Empire' (2008), discuss the relevant evidence in relation to their arguments, and to suggest our own theory of how the Sasanian Empire operated. Christensen argued for the strength of the Sasanian monarchy and the subservience of the aristocracy to the kings, whilst Pourshariati's thesis stressed Sasanian royal weakness and the relative power of the aristocracy. These theses are incompatible, offering fundamentally different conceptions of the natures of the Sasanian monarchy and aristocracy, and how they interacted with each other. Firstly, this thesis critiques the models established by Christensen and Pourshariati, especially their failure to acknowledge evidence at variance with their thesis, and their lack of discussion concerning how the aristocracy perceived their relationship with the monarchy. We then turn to our own discussion of the evidence relating to the Sasanian monarchy and royal power, and the cultural outlook of the aristocracy, with reference to the above theories, so as to understand how strong the Sasanian monarchy was, the nature of royal power, and how the aristocracy perceived their relationship with the crown. We argue for a conception of Sasanian Iran somewhere between the theories of Christensen and Pourshariati. There is very little evidence that the Sasanian kings ruled through a state enjoying significant institutional power; indeed Sasanian power seems very limited in the periphery of the Empire. However, the inherent respect for the monarchy held by the aristocracy, and the ties of mutual dependence which existed between kings and aristocrats, allowed for Sasanian rule to in general be highly effective.