Game of Thrones finales are often marked by destruction, but Season 7 included a little bit of hope. Not all marriages in Westeros are bloody, even if they are ultimately doomed in one way or another. The flashback to Rhaegar and Lyanna's secret wedding on Game of Thrones not only proves definitively that Jon Snow is not a bastard, but was a sweet moment that proves the Starks and Targaryens were always meant to get along.
After being aloof and weird about his Three-Eyed Raven skills all season, Bran finally gave fans the goods and dished about Jon Snow's true origin. Gilly and Sam helped as well. Now, both Sam and Bran know the truth about Jon. This is really going to shake things up in Season 8.
In the scene, Aisling Franciosi returned to her role as the Wolf girl Lyanna, and Welsh actor Wilf Scolding joined the show as Rhaegar Targaryen. It's nice to finally see the Last Dragon on screen. Enough people have talked about Rhaegar, with equal amounts of praise and disdain. Now we know he was really a good guy all along and Robert's Rebellion was a lie. Unfortunately his reputation was pretty destroyed, but at least Rhaegar had love and a son for a little while.
Their wedding was a Faith of the Seven ceremony too, which is interesting. While that is technically the religion currently practiced in King's Landing, the last ceremony with vows quite like this on the HBO series was between Robb Stark and Talisa, a similarly doomed couple. House Targaryen is traditionally Valryian, and House Stark worships the Old Gods.
How will Jon react when he learns of his true parentage and that he's the rightful king? We'll have to wait until possibly 2019 to find out. So, let the theorizing commence.