The tradition of the Sabbatine Bull seems to have spread in the fifteenth century. Historically, however, the tradition of the Sabbatine Bull is vulnerable. No evidence of the Bull appears in the registers of John XXII. Its literary character is entirely too odd to recommend it as the work of John XXII. The authenticity of the Bull was keenly contested, especially in the seventeenth century, but was vigorously defended by the Carmelites. The chief opponents of its authenticity were Joannnes Launoy and the Bollandist Daniel Papebroch, both of whom published works against it. Today it is universally regarded by scholars as inauthentic, even the ""Monumenta histor. Carmelit."" of the Carmelite B. Zimmerman (I, Lérins, 1907, pp. 356-63) joining in rejecting it. Carmelite historians have determined that the bull is a fifteenth-century forgery originating in Sicily.