'Provincial' slid from 'of a province' to 'narrow-minded' — distance from the capital bred the insult.
Of or relating to a province; of or relating to areas outside the capital or main cities of a country; having the manners, viewpoints, or characteristics associated with people from the provinces; narrow-minded, unsophisticated.
From Old French 'provincial,' from Latin 'provincialis' (of a province), from 'provincia' (a territory outside Italy governed by a Roman magistrate). The etymology of 'provincia' is debated: traditionally derived from 'pro-' (on behalf of) plus 'vincere' (to conquer), implying 'a conquered territory administered on behalf of Rome,' though modern scholars question this folk etymology. An alternative proposal connects it to a pre-Latin term for an assigned sphere of duty. The word's semantic trajectory is culturally revealing: from a neutral administrative term in Roman usage, 'provincial' acquired
The French region of Provence takes its name directly from Latin 'prōvincia.' Southern Gaul was one of the earliest Roman provinces outside Italy — simply called 'the Province' (Prōvincia Nostra, 'our province'). The proper noun fossilized: long after the Roman Empire fell, the region kept its name, which literally just means 'province.' It is as if a region were permanently named 'The Colony' or 'The Territory.'