Gawhar Shad commissioned this congregational mosque as part of her extensive renovation program for the shrine of Imam Riza. Located immediately to the south of the mausoleum, accessed through the dar al-siyadah, the mosque is of the familiar four-iwan courtyard form. The depths of the iwans are irregular, a response to the location of existing buildings within which it was inserted. Two round minarets that rise from the ground, flanking the southern iwan, constitute an innovation in Persian architecture as minarets in Iran were previously positioned above the parapets. A blue faience dome that was rebuilt with poured concrete in the 1960's surmounts the southern iwan.
The mosque is known for its tile mosaic decoration, an art form that peaked during the Timurid period. On a high base of marble revetment, panels of enamel brick and tilework are arranged in two stories that run around the courtyard, capped by a band of calligraphy designed by Gawhar Shad's son Baysunghur. Vivid, energetic floral patterns in tile and geometric schemes in brick are used in alternation, emphasizing the strong rhythm around the courtyard.
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