How did Brienne get Oathkeeper?

Related questions

1. Who has lightbringer sword?
2. Does anyone live on Dragonstone?
3. Where is winterfell in real life?
4. What happened to Ned Stark's sword?
5. Where is the Red Keep in real life?
6. Where is Braavos in real life?

Tags

1. #releases
2. #brienne
3. #slice
4. #strong
5. #winterfell
6. #horses
7. #pursue
8. #oathkeeper
9. #sword
10. #execute
11. #guards
12. #after
13. #kills
14. #enough
15. #attempt
16. #battle
17. #later
18. #finds
19. #through
20. #three
21. #stannis
22. #valyrian
23. #steel
24. #baratheon