Many fans of the TV Show "Game of Thrones" have long suspected that the real parents of Jon Snow were not Ned Stark and an unknown woman with which the man had a sexual encounter during the rebellion of Robert Baratheon. Many words were said in the forums, but until episode 6x10, where it was finally revealed to us the identity of the parents of Jon no one was sure about his origin.

Who knew the truth about Jon Snow?

Even if we can say that some people knew the truth about Lyanna Stark and Rhaegar Targaryen and how this truth was silenced through Robert Baratheon, this does not mean that all in Westeros were wondering if Jon Snow, the bastard son of Ned Stark, was actually his grandson and also a Targaryen.

Who other than Ned, the three members of the Royal Guard and Howland Reed, knew the truth about the origins of Jon Snow?

Someone think that Lord Baelish, aka Littlefinger, suspected that Jon was actually the grandson of Ned, but he could not know if his suspicions were correct or not. None of Starks would have thought that the boy was a Targaryen and even Catelyn never had the slightest suspicion. Nor did the Lannisters suspect the truth, or they would not hesitate to kill Jon. Robert Baratheon, who had plans to exterminate the Targaryen dynasty, so that no one could claim the Iron Throne, didn't suspect the true origins of Jon Snow, otherwise he would not hesitate to kill him. And finally, we can certainly say not even Daenerys knew of the existence of another Targaryen, a rival claimant to the throne.

Maester Aemon knew Jon Snow's origins?

Certainly, during the first season, no one would have imagined that the Maester Aemon, in a speech during episode 1x09, had leaked the truth about the birth of Jon Snow. The Elder Maester's words are a clue, or is a simple speech of a wise man, who is also a Targaryen?

We can say that the old Maester was the only one among the Night's Watchers to show interest in the bastard of Winterfell and his vote was decisive in the appointment of Jon Snow to Lord Commander. He was deploying the side of one of his descendants, or perhaps he just wanted the boy to remain at the Barrier, where he was safe, away from Westeros?

At this point, it is also normal to wonder if Ned Stark knew that Maester Aemon was a Targaryen, and is it possible that Ned has revealed to him that Jon was, in fact, his nephew? And in this case, among the things that the old Maester has left to Sam, is there some evidence about the origins of Jon?