Barnabites
From BiblePortal Wikipedia
Charles Buck Theological Dictionary [1]
A religious order, founded in the sixteenth century, by three Italian gentleman, who had been advised by a famous preacher of those days to read carefully the epistles of St. Paul. Hence they were called Clerks of St. Paul; and Barnabites, because they performed their first exercise in a church of St. Barnabas at Milan. Their habit is black; and their office is to instruct, catechise, and serve in mission.
Cyclopedia of Biblical, Theological and Ecclesiastical Literature [2]
The Nuttall Encyclopedia [3]
A proselytising order of monks founded at Milan, where Barnabas was reported to have been bishop, in 1530; bound, as the rest are, by the three monastic vows, and by a vow in addition, not to sue for preferment in the Church.