How many died building St Petersburg?

Related questions

1. How old is St Petersburg Russia?
2. Why is it called St Petersburg?
3. What was the nickname for St Petersburg?
4. Is St Petersburg dangerous?
5. Why did Peter build St Petersburg?
6. Is Leningrad the same as Stalingrad?
7. Is St Petersburg in Europe or Asia?
8. Is Stalingrad St Petersburg?
9. What was significant about St Petersburg?
10. What is Saint Petersburg famous for?

Tags

1. #sweden
2. #process
3. #serfs
4. #russian
5. #prisoners
6. #swedish
7. #building
8. #estimates
9. #dragooned
10. #first
11. #construction
12. #russia
13. #along
14. #estimate
15. #years
16. #petersburg
17. #historians
18. #toiled
19. #against