Dante Alighieri (1265-1321)
He was a Florentine poet of the Middle Ages. His central work was the Divine Comedy (Divina Commedia), which was written in Italian language. It was thought to be a new language because it was based on the regional dialect of Tuscany, with some elements of Latin and of the other regional dialects. One of his other works on linguistics was On the Eloquence of Vernacular (De vulgari eloquentia), which deals with the relationship between Latin and vernacular and analyses the origin of vernacular.