Öljeytü also constructed a Congregational Mosque in a kosh (pair) across from the madrasa (Islamic religious school) of his favourite wife.
According to the descriptions by the 17th century travellers Adam Olearius (d. 1671) and Jan Janszoon Struys (d. 1694), the mosque was based on the four-iwan plan (four monumental gates around an open courtyard) and had a domed sanctuary along the main longitudinal axis. The main entrance was flanked with polygonal minarets, drawn by François Préault in 1808. It is possible that Timur (ca. 1336-1405) was inspired by Öljeytü’s Congregational Mosque and used its design as the basis for his monumental mosque of Bibi Khanum in Samarqand (late 14th century). In 2005 Sultaniyya was listed as a World Heritage Site.
