Eastern canonical reforms of Pius XII
Under Pope Pius XII, there were the several reforms of Catholic Eastern canon law applying to the Eastern Catholic Churches. == Reforms of Eastern canon law == A commission was established in 1929 by Pius XI to draw up a schema for an Oriental Catholic canon code, the Commissionem Cardinalitiam pro Studiis Praeparatoriis Codificationis Orientalis.
Source: Wikipedia — Eastern canonical reforms of Pius XII (CC BY-SA 4.0)