Aḥmad b. Ayyūb, Ḥāfiẓ Nakhjawānī, a 7th–8th/13th–14th century architect. Little is known about his life but an insciption in a mausoleum in the city of Bardaʿa (Barda), in the Republic of Azerbaijan, bears his name.

The mausoleum, thought to be the resting place of a certain Shirwān Shāh (Khanikoff, 71), consists of a conical tower made of brick on a decagonal base (14m high and 10m in diameter) and it was completed in 722/1322 (Kalantarian, 639). The exterior of the tow…