Barnabites, Or Regular Clerks Of St. Paul, a religious order, so called from the church of St. Barnabas in Milan, which was granted them in 1545. The order consists of two branches, formerly distinct, but united into one during the time of St. Charles Borromeo. The origin of the older branch, who were properly called Ambrosians, is uncertain, but is supposed to date from the pontificate of Gregory XI. (1370-78). The younger branch was founded in 1532 by three priests, Zaccaria of Cremona, and Ferrari and Morigia of Milan, for the purpose of preaching and administering the sacraments among the populace of Milan, who had become much corrupted by the continual presence of a multitude of German soldiers in the city, and who were also much afflicted by pestilence. In 1579 their constitutions and rules were fully revised and established, under the direction of St. Charles Borromeo. The mother house is at present in Rome, and the order has about 20 colleges in Italy, Austria, and France.