With his concern for the united Oriental Churches with their combined ten million members, Pope Pius continued the initiatives of his predecessors, especially Pope Leo XIII and Pope Pius XI. These Churches, not unlike the Latin Church before the Code of 1917, had their own ancient laws, which were not codified. The reform of Oriental Church laws, the CIC Orientalis for the Oriental Churches, was completed during the pontificate of Pius XII. The new, very comprehensive Church laws governed matrimonial law, Church trials, administration of Church properties and religious orders and individual rights.