Thus the bishop of the important see of Seleucia (Bagdad), though subordinate to the patriarch of Antioch, had the title of Catholicus and power to consecrate even archbishops; and on the division of the see there were two Catholici under the patriarch of Antioch.
In Ethiopia, too, there were Catholici with less extensive powers, subject to the patriarch of Alexandria.
Fasti Temporis Catholici, by Edward Greswell; and by the same author (1854), Origines Kalendariae Italicae; and 1862, Origines Kalendariae Hellenicae.
Some were readmitted into the Catholic Church, and one, Durandus de Osca (1210), attempted to found an order of Pauperes Catholici, which was the forerunner of the order of St Dominic. Many were swept away in the crusade against the Albigenses.
The two churches of Iberia and Albania at first depended on the Armenian for ordination of their primates or catholici, and in large part owed their first constitution to Armenian missionaries sent by Gregory the Illuminator.
To him has sometimes been ascribed the anonymous treatise, Arnobii catholici et Serapionis conflictus de Deo trino et uno.