Rida’addin bin Fakhraddin — an eminent Muslin learned man, writer and Mufti — was the author of a famous voluminous manuscript «The Turks of Bulgar and Kazan» (in  569 folios). One part of this manuscript contains a valuable information on more than 100 mosques and their clerics throughout the provinces of the Volga-Urals during the late 19th — early 20th century, including the Market and City Mosques of Nizhny Novgorod and their imams. This data still attracts scholars’ attention, for the paper says a lot about the houses of worship in Nizhny Novgorod. Some heretofore unknown and unpublished but edifying details of the history of erection of the Mosques in Nizhny Novgorod and the main Russian market place nearby, curriculum vitae of their imams, the practice of election and appointment of imams are given in Russian translation as a supplement to the paper.