"Indeed, in a post to It.Hobby.Cucina, the Italian general cooking newsgroup, RoDante da Fano traces pizza's origins from Ancient Egypt to Imperial Rome, where there were a number of different kinds of flat baked breads with a variety of sweet or salty toppings, and goes on to say that the descendents of these proto-pizzas were common throughout the peninsula in the 1700s. In 1835, he continues, Alexandre Dumas noted in his diary that "in Naples pizza is flavored with oil, lard, tallow, cheese, tomato, or anchovies…" Other chroniclers listed other common toppings, also noting that pizza was a cheap food that Neapolitans ate for breakfast or lunch; in the 1870s things stabilized to a degree, when a Neapolitan pizzaiolo created the Margherita, which he named after Italy's beautiful queen, by sprinkling a few fresh basil leaves over a pizza topped with mozzarella and tomato -- red, white and green, the national colors. "

http://italianfood.about.com/od/breadspizza/a/aa042205.htm