Kot Diji Fort
Urban development in Sindh, started around 2,800 and 2,600 BCE during the Kot Diji Phase (Harappa Period 2 out of 5). Though initial planning was of smaller size than that of the later Harappa Phases, but many of the basic characteristics of later Indus society are identifiable such as script on pottery.
Early city planning is reflected in the layout of north-south and east-west oriented streets and houses, and the use of mud-bricks of two sizes with 1:2:4 ratios to build houses, massive mud-brick platforms, and perimeter walls . In addition, the site was divided into two distinct mounds each with a massive mud-brick perimeter wall. During this period Harappa emerged as a major regional center, integrating its hinterland as well as obtaining materials from distant resource areas.
The large collections of pottery from this area reveals a clear transition from the earlier Ravi pottery to what is commonly referred to as Kot Diji pottery. The later Kot Diji levels show a gradual transformation into what is commonly referred to as Harappa Phase pottery. When combined with the evidence of other artifact types, such as terracotta cakes, bangles, figurines and even architecture, it is possible to confirm that the Harappan culture emerged from the earlier Kot Diji culture and that it was not introduced to this area from outside regions.
These new developments of site organization and specialized crafts appear to be linked to the emergence of a more highly differentiated society during the Kot Diji Phase. Possible forms of social elaboration include the development of hierarchies and occupational classes as well as the inclusion of new ethnic groups, including those not previously incorporated into the urban structure. Such groups may have comprised pastoralists, hunters, fishers, and those associated with many of the specialized crafts and long distance trade that became increasingly important during this period and the following Harappa Phase.
The Fort Ahmadabad or Kot Diji Fort was built by Mir Sohrab Khan Talpur, between 1785 and 1795. The fort was built on a strategic location since it provided an edge over enemies marching from the east. A fatigued army could be encountered before trooping towards irrigated lands in search of water. The fort was apportioned into three parts among the Talpurs. It was formally named after Iranian Project Director of the Fort Mr. Ahmed under supervision of Muhammad Khan Zari Baloch tosafeguard Burhan former name of Khairpur.