Latin.
The Vernacular Indic language that was in use from around 300 BC to the Middle Ages is Prakrit. It was commonly spoken among the people in various regions of India during that time period and served as the language of everyday communication alongside Sanskrit.
Dante Alighieri was an Italian poet that lived and worked during the Middle Ages. He was the first writer to produce a significant work in a vernacular national language.
The native language of the people of an area is called the the vernacular. This was true in the Middle Ages, as it had been in ancient times and is today.
The official language of the Parthian Empire was Parthian, which is a Middle-Iranian Language (whereas Farsi is a Modern-Iranian Language). Aramaic was also commonly spoken as a vernacular in the western part of the Empire.
the noble language was latin
Yes.
The vernacular language is the language of the country, the language spoken by 'ordinary people' (and acquired as their mother tongue). In much of Europe it also meant 'as opposed to Latin'. Vernacular literature in Europe is used for literature in the language of the country (again, by contrast with literature in a foreign language). So, in the Middle Ages, Middle High German literature was vernacular, for example. In England, the vernacular meant 'English as opposed to Latin and French'.
They didn't avoid writing because 90% of the population DIDN'T KNOW HOW to write. They couldn't read either.
the middle class.
Dante Alighieri, Geoffrey Chaucer, Anthony Burgess
Without knowing what 'the following' is, we cannot answer your question.
Without knowing what 'the following' is, we cannot answer your question.