Why did Constantinople become Istanbul?

Related questions

1. What was Istanbul originally called?
2. How much did a Roman soldier get paid?
3. Why was Rome so powerful?
4. Why did the Byzantine Empire call themselves Romans?
5. What is the Byzantine empire best known for?
6. What countries were part of the Byzantine Empire?
7. Was the Byzantine empire the Roman Empire?
8. How did Constantinople's name change over 1100 years later?
9. Why is the Byzantine Empire important to study?
10. Did the Roman Empire really fall?

Tags

1. #ottoman
2. #constantinople
3. #turkey
4. #istanbul
5. #changed
6. #capital
7. #ankara
8. #republic
9. #empire
10. #collapsed
11. #officially
12. #angora
13. #calling
14. #foreign
15. #governments
16. #lasting
17. #finally
18. #businesses
19. #travelers