According to food historians, the Margherita pizza is the very first pizza ever made. As far as pizzas go, it's a very simple pizza to make and uses only the crust (which is traditionally a 12-inch size), olive oil, the sauce, tomatoes, mozzarella cheese (which may only be cut, not crumbled), and fresh basil.
The AVPN - Associazione Verace Pizza Napoletana sets the standards for the Margherita Pizza, which is the first type of pizza ever made.
"The VPN Association is the only no profit association that safeguards and promotes the culture of the real Neapolitan pizza worldwide. The True Neapolitan Pizza Association (Associazione Verace Pizza Napoletana, AVPN) is a non-profit organization and was founded in June 1984 in Naples with its legal and operational headquarters. Its mission is to promote and protect in Italy and worldwide the “true Neapolitan pizza“ (“verace pizza napoletana“), i.e. the typical product made in accordance with the characteristics described in the International Regulations for obtaining a collective brand mark “True Neapolitan Pizza“ (“Vera Pizza Napoletana“), in force since 1984, edited and registered by AVPN. The Association is also involved in the promotion and protection of the affiliated pizzerias and products related to the production filer of “true Neapolitan pizza“ and in the professionalization of pizza makers."