This paper investigates some features of the technical legal terms in Leges Langobardorum. Rothair’s Edict was the first written codification of the Lombard customary law. The passage into writing, the writers’ choice of Latin and the use of Roman law texts as sources and models play an important role in determining the features of their legal vocabulary. Within this perspective, the specialized lexemes of Lombard Laws, the use of terms in ordinary and technical meanings and the polysemy and monoreferentiality of legal terminology are discussed.