ماتيلدي
The origin of "Fortezza Vecchia" takes place not far from what once was "Porto Pisano" (Pisan Port) where a square tower was built in 1077, on request of Matilda of Tuscany, on the remains of a Roman tower; in 1241 the Pisans built a massive cylindrical tower, 30 meters high erroneously called "Mastio di Matilde" (Matilda keep).