Arnoldists were a Christian sect in the 12th century, named after Arnold of Brescia who criticized the great wealth and possessions of the Roman Catholic Church, and preached against baptism and the Eucharist. His disciples were also called "Publicans" or "Poplecans", a name probably deriving from Paulicians.
This article incorporates text from a publication now in the public domain: Chambers, Ephraim, ed. (1728). "article name needed". Cyclopædia, or an Universal Dictionary of Arts and Sciences (first ed.). James and John Knapton, et al.