STRANGER ━ Jon Snow

APPENDIX

A list of terms mentioned in "Stranger" and Game of Thrones that you should know. Use these for reference.

AZOR AHAI
" According to prophecy, our champion will be reborn to wake dragons from stone and reforge the great sword Lightbringer that defeated the darkness those thousands of years ago. If the old tales are true, a terrible weapon forged with a loving wife's heart. Part of me thinks man was well rid of it, but great power requires great sacrifice. That much at least the Lord of Light is clear on. "

Azor Ahai ​is a legendary figure in the faith of R'hllor. He was a legendary hero who lived approximately eight thousand years before Aegon's Landing. Thousands of years ago, darkness lay over the world and Azor Ahai was the hero chosen to fight against it.

To fight the darkness, Azor Ahai needed to forge a hero's sword. He labored for thirty days and thirty nights until it was done. However, when he went to temper it in water, the sword broke. The second time he took fifty days and fifty nights to make the sword, even better than the first. To temper it this time, he captured a lion and drove the sword into its heart, but once more the steel shattered. The third time, with a heavy heart, for he knew beforehand what he must do to finish the blade, he worked for a hundred days and nights until it was finished. This time, he called for his wife, Nissa Nissa, and asked her to bare her breast. He drove his sword into her living heart, her soul combining with the steel of the sword, creating Lightbringer.

He then used this sword to defeat the darkness of the Great Other. A prophecy foretells that he will be reborn as the Prince Who Was Promised. Red Priestesses around the land have elected several different people to be this.

Taken from the Game of Thrones Wiki.

NISSA NISSA
" It is said that her cry of anguish and ecstasy left a crack across the face of the moon, but her blood and her soul and her strength and her courage all went into the steel. "

Nissa Nissa ​was the wife of the legendary hero, Azor Ahai. In order to unleash the powers of the sword  so that he could defeat the darkness of the Great Other, he had to sacrifice her by plunging Lightbringer into her heart. Her sacrifice is one that many are grateful for and remember forever.

Taken from the Game of Thrones Wiki.

THE PRINCE WHO WAS PROMISED
" There will come a day after a long summer when the stars bleed and the cold breath of darkness falls heavy on the world. In this dread hour a warrior shall draw from the fire a burning sword. And that sword shall be Lightbringer, the Red Sword of Heroes, and he who clasps it shall be Azor Ahai come again, and the darkness shall flee before him. "

"The Prince Who Was Promised," sometimes called "The Prince That Was Promised" or "The One Who Was Promised," also known as "the Lord's Chosen," "the Son of Fire," and "the Warrior of Light," is a mythic figure in the religion of the Lord of Light. According to prophecy, this figure would be reborn "amidst salt and smoke" and pull a flaming sword from the flames, Lightbringer, to combat the coming darkness.

The prophecy about the Prince Who Was Promised says that he would be born from the line of House Targaryen. Most versions of the prophecy were written in High Valyrian, concluding that the word, "Prince," can be gender-neutral. Either a man or woman can be the Prince Who Was Promised.

Red Priestesses of Westeros have different predictions of who this figure must be, depending on their region, which is why there have been several different Travelers. There have been several predicted Princes, so thus there have been several Travelers. Regardless if a Prince was not the one to bring the dawn, they were still predicted by a known Red Priestess, so there have been many Travelers.