What happened to Jon Snow's real father?

Related questions

1. How old are the stark siblings in Season 7?
2. How did Sansa marry Ramsay if she's married to Tyrion?
3. Can Jon Snow and Daenerys marry?
4. How did Sir Gregor die?
5. Does Arya go blind permanently?
6. Who created the night king?
7. What is Jon Snow's real name?
8. What episode does Ramsay die?
9. Can Jon Snow Warg?
10. Is Jon Snow a Targaryen in the books?

Tags

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2. #lyanna
3. #mother
4. #trueborn
5. #finally
6. #knows
7. #which
8. #father
9. #bastard
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11. #dragon
12. #rhaegar
13. #rheagar
14. #stark
15. #means