This expression refers to the triumvirate of three Latin based languages; French, Spanish and Italian. All three have similar grammar rules and vocabulary. Italian is considered to be the most complex grammatically. The Italian nation as we know it has only existed for two centuries, and the version of Italian that is considered the vernacular is only one of many dialects that are still spoken on the peninsula. Dante's Inferno is still available in the Tuscan dialect in which it was written. The Calabrese still claim their dialect resembles the language of the Greek colonists that originally populated Sicily, Calabria and Puglia.
The depth, breadth and excellence of Italy's past and current artists and designers is pretty much a given today, and this sophistication is reflected in the complexity of their language. The nation that gave birth to the Renaissance can expect no less. Sometimes only a matter of proportion or color, material or cut, Italian elegance is apparent to all but the eyes and ears of barbarians. Those that seek to learn the Italian language often do so not only out of linguistic interest but also to learn the vocabulary of literature, art, fashion and food.