From the earliest documents concerning the history of Izmail city, a corpus of decisions and orders of Divan of the second half of the 16th century are published, a description of the 1591 Mehmed-Aga Charitable Foundation’s letters patent. On his initiative, a new city begins a large-scale construction. First of all, it is about the infrastructure of infrastructure: the pier, stone castle, mosque, hamam, caravan-saray, shops, etc. The pier was built in early March 1590, with a separate «place for repairing ships» (like a shipyard). In the middle of the 18th century, Izmail shipyard for the construction of civilian ships was located in the mouth of the Broska Valley (where it is today, 430 years later). The stone castle with towers was built (with the help of Moldovan workers) near the ferry, on a hilly shore, somewhere in the spring of 1590. By August 12, 1591, it had already been completed. It was supposed to protect the city from the Cossacks. The first chief of the artillery castle was a man named Mehmed bin Mustafa. He appointed representatives of the genus of yuroks (taife) from Asia Minor for the service in the fortress in the first years. In 1592, the garrison of fortification consisted of 36 people. Behind the fortress walls there was a cavalry detachment of 53 riders. The first Izmail castle was destroyed by the middle of the 17th century. However, its north-western (gate) tower survived and existed until 1790s. Izmail was in property of Habeshi Mehmed-aga from November 1589 to January 1591, when he died. Shortly before his death, all his property was rewritten to the charitable foundation (Wakif) of the black eunuchs of the Sultan’s harem. In the early 1780s, the Ottoman government initiated the construction of a fundamentally new bastion line of fortifications in Izmail. By August 28, 1781, the plan of the fortress – more precisely, the perimeter of fortifications around the city – was developed. The head of the building was the head of the internal guard of the Sultan Palace Selim-aga before he was replaced by Hadji Ahmed-aga – the head of the Sultan’s personal guard. The works were supervised by Mehmed Tahir, the Chief Architect of the Ottoman Empire. Directly in Izmail, his governor, named Nurullah, prepared the project documentation, including the plan. After the return of the city under the Ottoman Empire, the Turks immediately started a new phase of rearrangement of fortifications, taking into account the shortcomings of the previous project. As a result, the New Fortress was erected by the Hijra (1794/95). However, in fact, they had continued (with one or another scope of work) until July 1797. Currently, it is not certainly known who was the author of the project of this modernization. Probably Mohamed Rashid and the French engineer F. Kauffer