And having called his twelve disciples together, he gave them power over unclean spirits, to cast them out, and to heal all manner of diseases, and all manner of infirmities. Matt 10:1
The cult that has emerged here in Sarsina, a town in the hills between Tuscany and the northern Adriatic Sea, centers on the metal collar. Legend has it that St. Vicinus, bishop in Sarsina around AD 300, used it first as a form of self-castigation when he prayed. It resembles a shackle that might be used on a slave. He would put it around his neck attached to a heavy stone to focus his mind in penitence.
Eventually he began to use it to ward off evil spirits. St. Vicinus became one of the church’s early exorcists, and the fame of the collar and its purported powers have endured. (The one used now is not said to be St. Vicinus’ original but is believed to date to the 8th or 9th century, roughly the same time the church was built.) St. Vicinus