| Type of Fortress | Construction Date | Facts |
|---|---|---|
| Wooden | Middle of 860 | Construction began under Prince |
| Stone | On the verge of IX-X centuries | Construction of the stone defensive wall under Prince |
| Wooden | Beginning of ________ B. | The fortress is rebuilt after it was destroyed by the Norwegian Yarl Eric. |
| Stone | 1114-1116 years | The fortress is built by the Novgorod Prince and Posadnik Pavel |