Quote Originally Posted by Patricius
If playing as the Papal States is a guide, inquisitors appear at random and move automatically if not used by the Papal States player. Even if the Papal States were placed in the Americas inquisitors will appear, as they are just generated at various points on the map, quite possibly connected with high levels of heresy. Piety should protect a general, but maximising church construction is not always affordable.
Actually they disappear the same way. I don't know how or why but if you watch closely you will occasionally see them finish their work and evaporate…