This paper examines mainly the socio-economic life of Baku as the main factor in the development of the feudal city, i.e. the development of production, production forces and production relations of people over a 1200-year period. The work examined the economic life of the city, oil and salt production, issues of handicraft production, trade, money circulation. The issues of the internal structure of the feudal society of the medieval city were considered as far as the data of the primary sources and monuments of material culture allowed. In addition, the work describes and analyzes architectural monuments, shows the state of science and fine art of the city for a long historical period.