Overall, the cycle presents three, if not four different decorative styles, as many as the authors are believed to have been (
two for the Old Testament, at least two others, if not three for the New) and also their origins: they were identified possible Northern European, Arab and Byzantine "
workers", with specific references to ivory cycles produced in nearby Amalfi, but also in Northern Italy (especially the Ivories of Grado). However, the precise "
choice" of the episodes depicted suggests that behind the authors there was a specific and certainly cultured commission, perhaps ecclesiastical. To confirm this, all the figures, even the humblest, never appear rough or uncultivated, but always worked with extreme precision and finesse.