barnabite

from The Century Dictionary.

• noun “In the Roman Catholic Church, a member of a religious congregation properly styled “Regular Clerks of the Congregation of St. Paul,” but having their popular designation from the church of St. Barnabas in Milan, which was granted to them in 1545, soon after the foundation of the congregation. Their principal house is now in Rome.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Eccl. Hist.) A member of a religious order, named from St. Barnabas.