This document discusses the architectural patterns of Parthian and Sassanid periods that influenced the design of Iranian mosques. It identifies several key patterns including:
1) The spatial organization of buildings, seen in the order of iwan-dome house-iwan structures.
2) The iwan porch structure, which originated in the Parthian era and was widely used in Sassanid religious and palace architecture.
3) The courtyard (myansara), seen in structures like the Palace of Firuzabad that combined porch and courtyard designs. Many Iranian mosques incorporated this four-iwan courtyard pattern.
The document analyzes how these pre-Islamic architectural traditions from Parthian