Abstract
Roman Law is often considered as an intellectual matrix of contemporary laws and in particular French civil law. However, even if the vocabulary persisted, some legal concepts went throught great changes across history as law was step by step related to a subject’s power. The notion of thing originally meant the trial, the case, the litigious situation managed by the legal process. In this way the thing was directly a res iuris. In contemporary law system, the thing ordinarily specifies some goods on which the subject applies his property power. This view is understandable considering the evolution due to the theorization of subjective law that leads to promote a strong and exclusive separation between persons and things while Roman law could imbricate these legal categories.