The story
Named after the Italian actor Leopoldo Fregoli, who was renowned for his ability to make quick changes of appearance during his stage act.
Etymology from Wiktionary, CC BY-SA 4.0.
Fregoli delusion
Today it means: The often paranoid delusion that different people are in fact a single person who changes appearance or is in disguise. It may be related to a brain lesion. Full definition →