The differences in the evolution of Latin in the different regions of Italy can be attributed to the presence of three other types of languages: substrata, superstrata, and adstrata. The most prevalent were substrata (the language of the original inhabitants), as the Italian dialects were most likely simply Latin as spoken by native cultural groups. Superstrata and adstrata were both less important. Foreign conquerors of Italy that dominated different regions at different times left behind little to no influence on the dialects. Foreign cultures with which Italy engaged in peaceful relations with, such as trade, had no significant influence either.