SOCIO-CULTURAL FOUNDATIONS

5. From 1380-s until 1470-s

6. From 1470-s until 1572

7. From 1572 to 1690-s

8. From 1690-s to 1917

9. From 1917 to 1991

10. From 1991 and for some future

II. Pskov - Novgorod - Petersburg region

Number of cycles - 1

Number of subperiods - 10:

1. From ancient times up until VIII century AD

2. From VIII until mid XI century

3. From mid XI until early XIII century

4. From early XIII and until late XIII century

5. From late XIII century until 1471

6. From 1471 to 1572

7. From 1572 to 1700-s

8. From early XVIII century until 1917

9. From 1917 to 1991

10. From 1991 and for some future

III. Northern European region

Number of cycles - 1

Number of subperiods - 7:

1.1. From ancient times up until VIII century AD

1.2. From VIII until mid XI century

2. From mid XI until 1470