The article is dedicated to mental perception of movable property in the Frankish kingdoms of the Carolingian period (8th — 10th centuries). Study of property from the standpoint of legal mentalities allows to notice substantial changes that cannot be seen while only studying positive law. The issues discussed are: the features that distinguished movable goods as property; content and evolution of the concept “movables”; the place of movables within the complex of property rights. The study is based on legal sources: (1) on formulae, charters and cartularies that reflect legal practice; (2) on capitularies showing the immediate reaction of the law-maker to current matters. The sources of the first category show that movable assets meant treasures, arms, clothes, household utensils, tools, cattle and slaves without land. Analysis of the document form, of Roman origin, makes it clear that, although the concept “movables” was proper to these sources, it gradually lost its precise content: the lists of movable things gradually became standardized and ritualized. As for capitularies deriving from the Frankish barbarian tradition, the concept “movables” was alien to them. The law-maker thought main attributes of movable assets to be their opposition to real estate (to land and settled slaves), their quality of objects of trade, their usefulness. Regulation of movable assets by the legislation included restrictful attitude to their circulation, requirement for transactions of being moral. Moreover, capitularies stressed the difference between the ways in which movable assets and real estate were disposed of. This allows to assume that classification of assets into movables and immovables inherent to the ancien droit français and going along with distinct legal regimes, starts to get generalized in the Carolingian times. In the legal mentality of Carolingian society movable property stops being just the repository of real rights: it appears more and more often as the product of a landed estate, subject to the lord's personal authority: dominium or potestas.