The paesani of Roseto are people who live in Roseto. <em>Paesani </em>is a word from Italian, typically used by Italians. It is the plural form of the word <em>paesano</em>, which has several meanings:
fellow countryman
fellow Italian
comrade or friend (usually from the same neighborhood, city, or region)
peasant, rustic villager
This is how we know that paesani of Roseto are people living in Roseto.