Calumniae Juramentum Law and Legal Definition

The Latin maxim, calumniae juramentum refers to the oath against calumny or an oath of good faith. It is an oath which both the accuser and accused were obliged to make before any trial or purgation. The accuser is to swear that he would prosecute the criminal, and the accused is to make oath on the very day that he is to undergo the ordeal, that he is innocent of the claims of which he is charged.