Quarters outside the walls began to form, called proastion and suburbium and became important economic centers. In these quarters, trade took place and shops along with workshops were centered here. Eventually, many of these quarters too were surrounded by walls to protect them. In order to secure a supply of water, cisterns in open, safe spaces were used to gather water. In some unique cases, water was also gathered from nearby rivers. In the first half of the 14th century, the population of the cities grew greatly. Durrës is estimated to have had 25,000 inhabitants. The city became a center which attracted inhabitants from the rural areas. Durrës is known to have had a large number of inhabitants who came from the surrounding villages. Those farmers who migrated to the city were often forced to pay a fixed payment or to make up for this payment by working in a commune. Along with the farmers came noblemen from the surrounding areas, who either migrated permanently or spent a large amount of time in the cities to look after their economic interests. Many had possessions, stores, and houses in the city. The movement of noblemen to urban areas became normal and they were eventually integrated into the city become citizens and often taking government positions. Architecture The spread of Catholicism affected the architecture of religious buildings, with a new Gothic style, mainly in the Center and North Albania. These areas were attached to the Catholic church and thus had greater Western connections. Both the Catholic and Orthodox churches operated in Durrës and the surrounding areas, and therefore both Western and Byzantine architectural styles were followed. Western architecture could also be found in areas where Western rulers had possessions. Churches built in this form were built in Upper and Central Albania and were characterized by an emphasis on an East-West longitudinal axis with circular or rectangular apses. Among the most notable architectural monuments of this period include the Church of Shirgj Monastery near the village of Shirgj near Shkodër, the Church of Saint Mary in Vau i Dejës, and the Church of Rubik. The former two churches were built in the 13th century AD while the latter in the 12th century AD. Most of the churches built in this period were decorated with murals. List of rulers Kings of Albania Charles I 1272–1285 Charles II 1285–1294 Charles surrendered his rights to Albania