Fixed the transitions, fixed fonts and the spelling of Lyana to Lyanna.
The Origins of Jon Snow. Who were his parents?
The Clues taken from game of thrones seasons 1 2 3 4 and 5.
Spoiler Alert. Theory of Jon Snow Parents.
In the books there are a lot of stronger clues about John Snow (The tower of Joy excerpt for example). I have only included here, the clues provided by the tv show, Game of Thrones.