This thesis aims to explore a historical development of legal rules (according to CIC 1983, as well as non-codex cannons ) with respect to the Privileges of the Faith, i.e. the ancient Privilegium Paulinum and the more recent Privilegium Petrinum. The thesis provides a comparison of the common elements and differences between both legal institutes, and furthermore an identification of the major causes leading to changes in the canonical regulations. Based on practical examples of the application of these legal institutes, it concludes by discussing a potential future development of their application (de lege ferenda).