Letter 14 of Pope Gelasius, written on 11 March 494, was addressed to the bishops of Lucania and Bruttium (ie. nowadays Calabria) and Sicily. They were under Gelasius' direct metropolitan jurisdiction. The long letter is a "decretal", and contains mainly various norms regulating the rights and obligation of clergy.
Various thing could have been considered a demonic influence, among the epilepsy, as hinted by Fragment 8 of Gelasius I, where he orders to investigate whether a bishop, allegedly frequently collapsing because of the attacs of the devil, ever fell down at home or in public (Neil, Allen 2004: 153).