Final answer:
Large fortresses were located in each quarter capital, functioning as centers of defense and power within the city.
Step-by-step explanation:
Large fortresses were stationed in each quarter capital. Functioning as epicenters of power and defense within a city, these structures typically housed military personnel and served as strategic points for safeguarding the region. They would have been important in ancient times, particularly in locations that required defense against outside threats or centralized points of control within the city. If we paralleled ancient structures used for such purposes, they can be akin to the citadels mentioned in historical contexts, which served as monumental ceremonial centers and residential compounds for the ruling elite, highlighting the importance of fortifications in maintaining the socio-political structure of a city.
For instance, in ancient Rome, the forum, and not fortresses, was the center of civic and economic life. Meanwhile, city gates such as those described in ancient Mesopotamia served as congregation points for various members of society. However, this question appears to be asking about the location of defensive and strategic structures in the context of a quarter capital, which would be the fortresses in this scenario.