These names, indeed, continue even after the Pisan family of Lacon-Massa had by marriage succeeded to the judicature.
After this the Pisan supremacy of the island seems to have become more of a reality, but Arborea remained independent, and after the defeat of the Pisans by the Genoese at the naval battle of Meloria in 1284 they were obliged to surrender Sassari and Logudoro to Genoa.
The four wall-surfaces that flank the three western doorways are decorated with very beautiful sculpture in relief, once ornamented with colour, the designs for which, according to Burckhardt, must be ascribed to the architect of the whole, though executed by other (but still Sienese, not Pisan) hands.
In the r3th century Pisan merchants founded there a colony, Portus Pisanus, which, however, soon disappeared during the migrations of the Mongols and Turks.
The oldest of these maps which have been preserved, the socalled " Pisan chart," which belongs probably to the middle of the 13th century, and a set of eight charts, known by the name of its former owner, the Cavaliere Tamar Luxoro, of somewhat later date, are both the work of Genoese artists.