In the spring and summer of 1560, the large Monastery of Dormition and the smaller Vvedensky convent were simultaneously built, as well as two trade and industrial settlements with various buildings for residential, economic, and religious purposes. The monastery was initially surrounded by a stockade of sharpened poles. Later, in the mid-17th century, it was replaced by two parallel log walls, filled in between with earth and stones. A covered walkway with arrow slits went along the top of walls and above the walls nine powerful towers were raised. Thus, on the spot of an ancient settlement, an important fortified stronghold was created, which would play a large role in the defense of the northwestern borders of Russia.