EN
The article deals with the relationship and interaction of Roman and canon law. The first part (Introduction to Roman Law) describes the developmental stages of Roman law and its "second life" (the process of its reception). The second part (Roman Law and the Law of the Catholic Church) deals with the relationship of Canon Law to Roman Law according to the individual stages of development of Canon Law: in the period of the so-called "old law" (jus antiquum), where the principle of Ecclesia vivit lege Roman is shaped; in the period of the so-called "new middle age law" (jus novum medii aevi), when Roman law became an official supporting source of canon law, and in the period of the so-called "latest law" (jus novissimum), when the Code of Canon Law of 1917 no longer recognises Roman law as a subsidiary source of canon law. Roman law thus definitely becomes a historical right in the Church.