This paper tries to survey the use of geometric patterns in stucco decorations as an important identity and cultural element in the Sasanian era building designs. Seven frieze patterns were used in order to understand the practical geometry in Sasanian stucco. The studied stuccoes were found during archaeological excavations conducted between 2015 and 2017 at e Jahangir Dome and Guriye Stuccos in Eivan, Ilam province. In this article, the discovered stuccoes have been examined, results of which indicate that stuccoes can be divided into three categories based on their features and applications: geometric patterns, vegetal patterns, and animal patterns. Comparing these stuccoes with those found elsewhere such as Qale Yazdegerd, and Ctesiphon shows that the buildings of Jahangir Dome and Guriye were noble houses in the Sasanian period, with their vegetal motifs and mythological animals being e formed under the influence of religious and ritual elements. The survey of motifs on the base with seven frieze patterns shows artists’ adherence to the principle of symmetry and repetition.
