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In ancient Rome, a decretum was a type of legislation issued by the Roman emperors. These enactments were decisions made by the emperor when acting in a judicial capacity. The term decretum itself translates to "decree" or "ordinance".12

Roman emperors had several forms of legislation at their disposal, including edicts (proclamations), mandata (instructions to subordinates), and rescripta (written answers to legal questions). The decreta specifically represented the emperor's judicial rulings. These imperial enactments played a significant role in the development and application of Roman law over time.13

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