Calligraphy art in Islamic architecture has been existed in Kufic form especially in the 13thAD., this was the time of the Mongol Ilkhanids in Iran. The evidence for Square Kufic under Ilkhanid religious freedom bear variation of meanings which indicates the religious orientation of the constructors. Sometime between two square Kufic inscriptions on different buildings are seen similarity on the rules of design and religious orientation which suggest unique works of one calligrapher. One of the most innovative one is in the mausoleum PirBakran. A large square panel containing salutation on the Prophet Muhammad and Twelve Imams is in the main exterior of the mausoleum. A similar Square Kufic containing same salutation exist in the Haftshuiyeh Mosque in a Mihrab Panel. Both monuments are in two districts of the Isfahan province not far from each other.
The contribution of this work is to extract the pattern of a damaged Kufic calligraphy in Haftshuiyeh Mosque considering the similar inscription in the mausoleum of PirBakran. There are some other decorative motives on the Haftshuiyeh mihrab find similars in the ornament of the PriBakran. With attention to the Kufic calligraphy works of PirBakran and Haftshuiyeh, their similar unique content and similar designs of both inscriptions, support the suggestion that the inscription of Haftshuiyeh, may originate from the calligrapher of PirBakran mausoleum. The aim of this study is to describe, analyze and compare the inscription of Pirbakran with Haftshuiyeh in order to find the word formations and compositional schemes and the rules of calligrapher’s design. To identify different structure and variation of the alphabet of Kufic letters, each word has been studied as far as possible in the PirBakran and Haftshuiyeh. Following the calligrapher’s rules, forms of the words, authors redesign and give explanation on the missing part of the Haftshuiyeh inscriptions.