Why did they call it Prussia?

Related questions

1. Does Prussia exist today?
2. What do they drink in Germany?
3. What was Germany called before it was called Germany?
4. Is Germany safe?
5. What's unique about Germany?
6. What nationality were the Prussians?
7. What did Prussia turn into?
8. Are Germans Nordic?
9. What food is Germany famous for?
10. Why is Germany called Germany?

Tags

1. #prussia
2. #union
3. #medieval
4. #lands
5. #brandenburg
6. #order
7. #duchy
8. #century
9. #derives
10. #knights
11. #conquered
12. #catholic
13. #military
14. #proclamation
15. #teutonic
16. #german
17. #inhabited
18. #organized
19. #prussians
20. #kingdom
21. #crusaders