Calumniae Juramentum – this legal term literally means “oath against calumny”. It comes from Latin and in the practice it finds application in the Criminal Law, where refers to a specific statement made both by the prosecutor and the convicted before start of the trial. The role of this statement is to oblige both parties to present all proofs they handle and to perform such a behavior to discover the truth about the subject of the Trial. A similar term is “calumniate jusjurandum”, which literally means “oath of calumny”. Within the Civil Law it refers to a promise by the claimant that they won’t participate with illegal intentions in the process.