PPR — Turin and centres of I-II-III rank (tav. P4)

The data, punctual, classifies Piedmontese centers in 4 historical ranks, distinguishing: Turin, first-ranking centres (capital and dominant cities, diocesan headquarters, administrative centres), second-ranking centres (administrative and market centres of sub-regional importance, centres recognised as “cities” in ancient regime and until post-unitary, centres with functional specialisation of regional importance), third-ranking centres (centres with strong morphological identity, centres of recognizable functional complexity, specialised centres of subregional importance, abandoned settlements known through archaeological investigations)