The history of pizza begins in antiquity, when various ancient cultures produced basic flatbreads with several toppings. A precursor of pizza was probably the focaccia, a flat bread known to the Romans as panis focacius, to which toppings were then added.[1] Modern pizza developed in Naples when tomato was added to the focaccia in the late 18th century.[citation needed] The word pizza was first documented in A.D. 997 in Gaeta[2] and successively in different parts of Central and Southern Italy. Pizza was mainly eaten in Italy and by emigrants from there. This changed after World War II when Allied troops stationed in Italy came to enjoy pizza along with other Italian foods.