A long story short: in the old castle on the hill in Trasmoz the occupants made fake coins. To hide what they were doing and to keep the people from investigate them it was said that witches and sorcerers were in there rattling chains and boil magic potions. This explanation worked well and ever since then the village is associated with witches and witchcraft.
This lead to the people of Trasmoz being banned from the Catholic church. The church never forgave the defeat and, with the permission from Pope Julius II, they caste a powerful curse over the village. This curse can only be lifted by a Pope but this haven't happened until this day.