The last city I will report is Valsimbra. This city was build in the time cities must have a specialization in order to supply other cities. This one, with the city of Grana was the grain supplier of all other cities.
This only city has more than 80 large states producers of grain. For maintenance this productivity it was necessary more than 300.000 inhabitants. This was a strategy city but the invention of the green houses and other modern food system made this city to loose most of its value and became into a decayed town.