- "The Lord let you come back for a reason. Stannis was not the Prince Who Was Promised, but someone has to be."
- ―Melisandre to Jon Snow
"The Prince That Was Promised", sometimes called "The Prince Who 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 prophesied savior in the religion of the Lord of Light. According to the prophecy, this figure would be born "amidst salt and smoke" and pull a sword named Lightbringer from flames, which they would use to combat an impending darkness. The prophecy was originally written in High Valyrian, and this lead to a mistranslation as the nuances of that language were forgotten over the centuries: in High Valyrian, the word that corresponds to "prince" is gender neutral, so the correct name for this prophesied savior is "The Prince Or Princess that Was Promised", indicating that it could be a man or a woman.
According to Melisandre, a red priestess of the Lord of Light, Stannis Baratheon, Lord of Dragonstone and self-proclaimed King of the Andals and the First Men, is the prophesied Prince. However, after Stannis is defeated in battle and Jon Snow, the Lord Commander of the Night's Watch, is raised from the dead, Melisandre claims Stannis was not the Prince, but "someone must be", suggesting she may now believe it is Jon. She later confirms her belief in Jon as the Prince Who Was Promised to Ser Davos Seaworth.
Another Red Priestess, established in Volantis, preached to a group of slaves and freedmen that Daenerys Targaryen is their prophesied savior. Kinvara, the High Priestess of the Red Temple of Volantis, is also certain that Daenerys is the one who was promised, citing her freeing of slaves and birthing of dragons from stone as evidence. She agrees to send her best priests and preachers throughout Essos, spreading the good word about the Queen.
Banished from the North, Melisandre learns of Daenerys Targaryen and her dragons. She lands on Dragonstone to make Daenerys aware of her destiny and to tell her of Jon Snow's importance as well in the coming war.
In the books
In the A Song of Ice and Fire novels, the Prince That Was Promised is implied to be the reincarnation of a hero known as Azor Ahai, a legendary warrior who supposedly lived thousands of years ago. Stories about the Long Night - or a similar cataclysmic event - are told throughout Essos, one version of which says that a great darkness descended upon the land. Wielding a flaming sword called Lightbringer, Azor Ahai rose up and defeated this darkness. There is some debate among fans as to the interchangeability of "Azor Ahai" and "The Prince That Was Promised": It seems that Azor Ahai is the name given to the legendary figure, while the Prince That Was Promised is more properly his reincarnation. Melisandre, a red priestess of R'hllor, has mentioned the Prince that was Promised and Azor Ahai interchangeably, but tends to use the name Azor Ahai far more often. In any case, the books do not make an explicit connection between the stories of Azor Ahai and the prophecies of the Prince That Was Promised.
Moreover, it is never clearly revealed where the prophecy about the Prince originated, or what culture/religion made the original prediction. Legends of Azor Ahai are widespread across the further east of Essos, though he is known by different names, depending on the region. According to Melisandre, who hails from the mysterious city of Asshai, the prophecy about the Prince was known in that city five thousand years ago, but even this was millennia after Azor Ahai supposedly lived.
The prophecy about the Prince That Was Promised said he would be born from the line of House Targaryen - Stannis Baratheon does match this description because his grandmother was a Targaryen, but he was not born at a place of "smoke and salt" (which can be Dragonstone, a volcanic island) - he was born in Storm's End.
Although Daenerys's gender should raise doubts as to the Red Priestess's identification of her as the Prince That Was Promised, Maester Aemon points out that in High Valyrian (the language most versions of the prophecy were written in), the word corresponding to "Prince" is gender-neutral. Aemon quickly realizes this after Melisandre begins proselytizing upon her arrival at the Wall. Although he didn't realize it during his years of correspondence with Rhaegar Targaryen, Melisandre's identification of Stannis as the Prince makes him reconsider the evidence, if only to shut her up. In the series, Kinvara seems to have come to this conclusion, while it is Missandei who points out the translation issue on-screen. In an interview with the LA Times, Carice van Houten confirmed that Melisandre still believes Jon to be the Prince, and has only reached out to Daenerys because she now believes both to be somehow important.
Garth Greenhand · First King · Florian & Jonquil · The Grey King · The Griffin King · Joramun · Lann the Clever
Night King · Night's King & Night's Queen · The Rat Cook · God-on-Earth · The Prince That Was Promised