They are seldom represented before Constantine's time; the oldest fresco in which an angel appears is a 2nd-century "Annunciation." The winged angel does not appear until the 4th century. At first angels were not represented unless historically necessary but after the 5th century they become favorite subjects, and were painted as attendants on the principal figures of a picture.
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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