Azor Ahai, the prince that was promised, is Rhaegar Targaryn. That's kind of lame, since he even thought he himself was The One, but then after a while, he began to think his son was the prince that was promised. Remember that Rhaegar was born at Summerhall on the same day as when it burned down, meaning he was born amidst salt and smoke. Well, if Rhaegar is Azor Ahai, then that could mean Jon Snow is Lightbringer. Think about it. The original Azor Ahai finally tempered the sword that defeated the darkness by driving it into the heart of his lover Nissa Nissa, killing her. Rhaegar put Jon Snow (Lightbringer) into Lyanna, and when he was born, it killed her. Nissa Nissa died with a cry of anguish and ecstasy, much like Lyanna might have when birthing her only son, but knowing she would perish shortly thereafter. Now, Jon is the guy who has already been fighting the Others, and he is now in cahoots with Dany to hopefully bring her dragons (dragon fire = light) to fight the wights.
Summerhall is a very mysterious topic in the books and this is probably because it holds a great secret that's too revealing to the overall story. So, to me, that's just more fuel in the fire for this theory.
What are your thoughts? Maybe this has been put forward before but I had never heard it.
*Edit: Wow great conversations below! Some extra things to consider from the comments:
- Jon is already described as a sword - "I am the SWORD in the darkness. I am the watcher on the walls. I am the FIRE that burns against the cold, the LIGHT that brings the dawn, the horn that wakes the sleepers, the shield that guards the realms of men. "
- "The dragon has 3 heads" - Jon is Rhaegar's third child. This further aligns with the ancient Azor Ahai story where he tempered the sword perfectly on the third try when killing Nissa Nissa. Ergo, Rhaegar's third kid killed the love of his life as well.
- Born amongst salt and smoke - Rhaegar was born at Summerhall on the same day it burned to the ground (fire = smoke). The kingdom lost the current king at the time, a prince, and the captain of the Kingsguard (King Aegon V, prince Duncan, Duncan the Tall). These deaths would certainly lead to many tears (tears are salty). Also, recall that once he was older, Rhaegar wrote sad songs that made the maidens cry.
- Several have been adamant that Lightbringer has to be a sword, which I get it, it's what you'd think since the story is about a sword. But isn't that too simple and cookie cutter for GRRM? If Rhaegar is the PtwP, then Jon being Lightbringer has to be the twist that satisfies, yet keeps the mystery from being guessed a mile away.
- Just as Lightbringer was a flaming sword, Jon is a reanimated human powered by the fires of the Lord of Light. He is most certainly hot to the touch like Mel (not confirmed).