Timeline

1st millennium BC- Archaeologists in Sardinia found ancient remains of a flattened bread similar to pizza that must have been very popular among its community.
6th Century B.C- Writings of the conquests of Darius the Great (521-486 B.C.) mention that his soldiers baked a kind of flat bread and then covered it with cheese and other toppings.
3rd Century B.C.- Famous Roman historian Marcus Porcius Cato (234-149 B.C.) mentioned in his memoirs about "flat round of dough dressed with olive oil, herbs, and honey baked on stones."
1522- After tomatoes were first imported to Europe from the New World, people of Naples first managed to combine them with their bread products. This created the earliest form of modern pizza.
1830 - Antica Pizzeria Port'Alba, the first ever modern pizzeria, opened in Naples.
19th Century - By the end of 19^th century, citizens of Naples ate pizza for breakfast, lunch and dinner. The manufacturing of pizzas increased and pizza was sold on the streets, and later on in pizzerias.
1905 - First American license for baking pizzas granted to Gennaro Lombardiin Spring Street in New York City.
1912 - Papa's Tomato Pies, one of the oldest pizzerias that is still active, was opened in Trenton's Chambersburg.
1943 - Invention of Chicago-style deep-dish pizza.
1957 -The first supermarket frozen pizza was released by Celentano Brothers. Soon after that, frozen pizzas became very popular across the US.
1958 - Opening of the first Pizza Hut in Wichita, Kansas.
1995 -The first appearance of revolutionary "self-rising'' crust was unveiled by Kraft.