In Christianity, angels are the agents of God, based on angels in Judaism. Various works of Christian theology have devised hierarchies of angelic beings. The most influential Christian angelic hierarchy was that put forward around the turn of the 6th century AD by Pseudo-Dionysius the Areopagite in his work "De Coelesti Hierarchia" ("On the Celestial Hierarchy"). He claimed to be an important figure who was converted by Paul the Apostle, who authored most of the New Testament, and his work enjoyed greater influence than it would have if he had used his actual name, until Erasmus publicised doubts about the age of the work in the early 16th century.