Latin evolved during the Middle Ages into a new language, the ""volgare"". The latter emerged as the confluence of various regional dialects, among which the Tuscan dialect predominated, but the population of Rome also developed its own dialect, the Romanesco. The "Romanesco" spoken during the Middle Ages was more like a southern Italian dialect, very close to the Neapolitan language in Campania. The influence of the Florentine culture during the renaissance, and above all, the immigration to Rome of many Florentines following the two Medici Popes (Leo X and Clement VII), caused a major shift in the dialect, which began to resemble more the Tuscan varieties. This remained largely confined to Rome until the 19th century, but then expanded to other zones of Lazio (Civitavecchia, Latina and others), from the beginning of the 20th century, thanks to the rising population of Rome and to improving transportation systems. As a consequence of education and media like radio and television, Romanesco became more similar to standard Italian. Dialectal literature in the traditional form of Romanesco includes the works of such authors as Giuseppe Gioachino Belli (one of the most important Italian poets altogether), Trilussa and Cesare Pascarella. It is worth remembering though that Romanesco was a ""lingua vernacola"" (vernacular language), meaning that for centuries, it did not have a written form but it was only spoken by the population.