Abstract
C 4.41.1, issued by Valentinian I (373 AD), forbade the sale of wine, oil, and fish sauce to the barbarians. This regulation stands out as the most comprehensive trade restriction with barbarians during Late Antiquity. The aim of this paper is to conduct a thorough analysis of the constitution, delving into aspects such as its dating, its connection to CTh. 3.14.1, and the meaning of the phrase ne gustus quidem causa. Additionally, it seeks to contextualize the law within its historical milieu and explore its Wirkungsgeschichte.

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