Chakavian
Chakavian in its actual use is the least spoken Serbo-Croatian dialect, being spoken only by 12% Croats. It is now mostly reduced in southwestern Croatia along the eastern Adriatic: Adriatic islands, and sporadically in the mainland coast, with rare inland enclaves up to central Croatia, and minor enclaves in Austria and Montenegro. All areas of old contacts with Romance languages.
Republic of Ragusa
According to Graubard:
Croatian was normally spoken among lower classes, Italian among the upper. Ragusans were in general bilingual, speaking Croatian in common day-to-day duties and Italian in official occasions or mixing both. Literary works of famous Ragusans were written in both Croatian and Italian. Among them are the works of writers Džore Držić, Marin Držić, Ivan Bunić Vučić, Ignjat Đurđević, Ivan Gundulić, Šišmundo (Šiško) Menčetić, and Dinko Ranjina.