In the XVIII century nearly all the cities of  Salento hitten by the earthquake of 20th  February 1743, assisted to the discouragement of the medieval town-walls building, often built up on previous fortifications in some cases dated back to the period  Messapico and Bizantino, in order to recover new building areas. The nineteenth-century historiography of municipal kind continuously marks this data when it delineates the development of the city centers of Salento between the XVIII and XIX century. Passing in review the notarial reports of local historians, often remained unknown, protocols, the platee of the University and those of the monastical orders, the chpaters one and the episcopal caterings, we realized about the phenomenon in all its extension and understand the reasons why rococò became a so diffused architectonic phenomenon from Martina Franca to Ostuni, from Nardò to Francavilla Fontana, and in many other places hardly hit bu the earthquake in all the immense province of the ancient Terra d’ Otranto. The walls of Ostuni, rebuilt in the low Middle Ages by the Angioini, between 1350 and 1356, with the technique of the "bag" construction and subsequently widened towards Southern Italy by the Aragoneses between 1487 and 1507, on plans written up by architects came with Alfonso duca of Calabria, went in great part pulled down in the 1700's for willing of the mayors and of the Decuria of those years, disabled to repair the damages felt by curtains and towers, and got in great part inglobate in private structures. The walls parcelling out allowed the increase of the public incomes through the estate’s collection and the notarial protocols completely testify this: the ancient administrators annotated in the "Platea" of the universal incomes all the " wall funds for the house building " sold to the privates ones. A testimony of walls integrity is given by the historian and clergyman Giuseppe Melles, that in 1811 wrote a short historical test about the city remembering as during the years of his youth was  still possible to walk along all the perimeter of the town-walls building and on the towers still without buildings.