Rome's historic contribution to language in a worldwide sense is much more extensive however. Latin became perhaps the most powerful language in history before today's English, and has bequeathed a great deal of the technical and scientific vocabulary of many languages, along with Greek. The Roman or Latin alphabet is the most widely used writing system in the world used by the greatest number of languages.The original language of Rome was Latin, which evolved during the Middle Ages into Italian. 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 ancient romanesco, used during the Middle Ages, was a southern Italian dialect, very close to the Neapolitan. The influence of the Florentine culture during the renaissance, and, above all, the immigration to Rome of many Florentines, amongst them the two Medici Popes (Leo X and Clement VII) and their suite, caused a major shift in the dialect, which began to resemble more the Tuscan varieties (the immigration of Florentines was mainly due to the Sack of Rome in 1527 and the subsequent demographic decrease).
This remained largely confined to Rome until the 19th century, but then expanded to other zones of Lazio (Civitavecchia, Latina), from the beginning of the 20th century, thanks to the rising population of Rome and to better transportation systems. As a consequence, Romanesco abandoned its traditional forms to mutate into the dialect spoken within the city, which is more like standard Italian, although it remains distinct from the other Romanesco-influenced local dialects of Lazio.
Dialectal literature in the traditional form Romanesco includes the works of such authors as Giuseppe Gioachino Belli, Trilussa, and Cesare Pascarella. Contemporary Romanesco is mainly represented by popular actors such as Aldo Fabrizi, Alberto Sordi, Nino Manfredi, Anna Magnani, Gigi Proietti, Enrico Montesano, and Carlo Verdone.