The Barnabites are Catholic priests and Religious Brothers belonging to the Roman Catholic religious order of the Clerics Regular of St. Paul (Latin: Clerici Regulares Sancti Pauli), founded in 1530. While they used to use the postnominal initials of simply "B.", they currently use C.R.S.P. Associated to the members of the Order are the Angelic Sisters of St. Paul and the lay members of the Barnabite lay movement.
Second in seniority of the orders of regular clerics (the Theatines being first), the Barnabites were founded in Milan, Italy in 1530 by three Italian noblemen: St. Anthony Mary Zaccaria, Bartholomeo Ferrari and Cardinal Jacopo Antonio Morigia. The region was then suffering severely from the wars between Charles V and Francis I, and Zaccaria saw the need for radical reform of the Church in Lombardy, afflicted by problems typical for that era: dioceses without a bishop, clergy with inadequate theological formation, a decrease in religious practice, and monasteries and convents in decline.