Premise: Bernardo Provenzano (] ; 31 January 1933 – 13 July 2016) was a member of the Sicilian Mafia ("Cosa Nostra") and was suspected of having been the head of the Corleonesi, a Mafia faction that originated in the town of Corleone, and de facto "capo di tutti capi" (boss of all bosses) of the entire Sicilian Mafia until his arrest in 2006.
Hypothesis: Bernardo Provenzano was the head of a mafia faction in the town of Corleone.