The final episode of "Game of Thrones" season 7 confirmed through Bran, the widely known and accepted theory of Jon Snow being the son of Rhaegar Targaryen and Lynna Stark. Added to that, it was also discovered, through Gilly and Sam, that both his parents were legitimately married, in Dorne, after Rhaegar obtained a divorce from his Dornish wife Elia Martell.

What these revelations further mean is that the former King in the North is neither a Jon Snow (bastard of the North) nor a Jon Sand (bastard of Dorne) but rather a legitimate child with the real name of Aegon Targaryen, who has a stronger claim to the Iron Throne than his aunt, lover, and Queen, Daenerys Targaryen.

But apart from being the rightful heir to Crown of the Seven Kingdoms, the revelations may have strengthened the argument in favor of Jon Snow/Aegon Targaryen as the prophesied prince that was promised.

It is also interesting to note that the prophecy played a key role in the eventual happening of the incestuous marriage of Jon Snow’s Targaryen grandparents.

Incest in Westeros

In the ASOIAF novel, A Clash of Kings, it was revealed that incest is considered a vile sin in the Seven Kingdoms both by the believers of the Old Gods and the Faith of the Seven.

But there were plenty of marriage between siblings or between close relatives among the noble houses in Westeros most notable among them were the Targaryens.

However, during the time of Aegon V Targaryen, the king was convinced the incestuous marriages, which became the tradition in House Targaryen were harmful and so he disapproved of the practice. To do away with the custom, Aegon V betrothed each of his four children to a member of different noble houses in Westeros.

Yet, all of Aegon V’s children broke off their betrothals.

Jaehaerys Targaryen, second son of Aegon, fell in love with and married his sister Rhaelle Targaryen.

Jaeherys II and the prophecy

Jaehaerys Targaryen became King after his older brother Duncan married a peasant girl and was denied to inherit the Iron Throne. Jaehaerys II, who married for love, did not extend the same choice to his son Aerys who later on became the Mad King.

The king forced Aerys to marry his sister Rhaella because of a prophecy made by a wood witch from the Riverlands that the prince that was promised would emerge from the line of Aerys and Rhaella.

Both Daenerys and Jon Snow are direct descendants of the Mad King Aerys and his wife Queen Rhaella. Daenerys is their daughter while Jon/Aegon is their grandson from Prince Rhaegar.

Though the prophecy can very well apply to a princess or Daenerys, the confirmation of Jon Snow’s Targaryen blood may just lead to another revelation he is the foretold prince that was promised.

But we all have to wait for that until "Game of Thrones" returns probably next year or 2019.