The seat or diocese of the pope because only he personally has the right from the Apostles to convert the whole world. From the earliest Christian centuries Rome was called the Apostolic see. A see founded or governed by an Apostle was called an Apostolic see, e.g., Alexandria, founded by Saint Mark.
This dictionary contains not only definitions and explanations of every subject in Religion, Scripture, tradition, doctrine, morals, sacraments, rites, customs, devotions and symbolism, but also accounts of the Church in every continent, country, diocese; missions, notable Catholic centers, cities, and places with religious names; religious orders, church societies, sects and false religions. It has brief articles also on historical events and personages, on the Old Testament and New, and on popes, prelates, priests, men and women of distinction, showing what the Church has done for civilization and correcting many errors which have hitherto passed for history.Wikipedia
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