The historical origins of the Narin Qal'eh complex in Ardabil date back to a period preceding the Qajar dynasty. Following its reconstruction for military purposes during the Qajar era, the complex emerged as one of the most significant architectural structures of its time. Nevertheless, it was entirely demolished during the early Pahlavi period, and today, only its name remains. Given the scarcity of documented sources regarding the architectural structure of the complex and the lack of comprehensive information about its spatial configuration, this study aims—perhaps for the first time—to conduct a spatial and physical analysis of the complex based on historical records and functional characteristics. Accordingly, the research identifies key criteria within the physical structure that align with its functional aspects and outlines the analytical framework used to uncover the spatial principles and meaningful architectural concepts embedded in the various functions of the Narin Qal'eh complex.
This qualitative study, grounded in library-based research and content analysis, employs a deductive approach to determine the overall structural framework of the complex. Exploratory investigations are also incorporated to refine the research through hypothesis testing. The study identifies several key criteria derived from the functional and physical representation of the complex, including: spatial diversity (enclosed, semi-open, and open spaces), functional variety (primary and auxiliary uses), movement circulation (hierarchical grading), access circulation (spatial, functional, and hierarchical), and spatial organization (centralized and axial systems). The auxiliary functions—such as religious, residential, and service-oriented spaces—were organized around the primary functions, which included defensive, military, and governmental uses. These primary functions were prioritized within an axial spatial system, emphasizing movement circulation and functional adjacency to enhance spatial quality. In contrast, auxiliary functions followed a centralized spatial system, occupying secondary priorities and often exhibiting hierarchical adjacency. Furthermore, the internal organization of spaces was shaped by climatic strategies and performance-based architectural techniques, reflecting a premeditated, coherent pattern consistent with the principles of Iranian architecture in the interior spatial design of the complex.