In the late Middle Ages and early modern period patricians also acquired noble titles, sometimes simply by acquiring domains in the surrounding "contado" that carried a heritable fief. However, in practice the status and wealth of the patrician families of the great republics was higher than that of most nobles, as money economy spread and the profitability and prerogatives of land-holding eroded, and they were accepted as of similar status. The Republic of Genoa had a separate class, much smaller, of nobility, originating with rural magnates who joined their interests with the fledgling city-state. Some cities, such as Naples and Rome, which had never been republics in post-Classical times, also had patrician classes, though most holders also had noble titles. The Republic of Ragusa was ruled by a strict patriciate that was formally established in 1332, which was subsequently modified only once, following the 1667 Dubrovnik earthquake.