The stone dragon is a dragon that Melisandre of Asshai wishes to waken on behalf of King Stannis Baratheon, using king's blood. Melisandre talks of the stone dragon in both the singular and the plural, as "stone dragons".
There is a prophecy that Azor Ahai will be reborn and will wake dragons out of stone. According to Melisandre, only a king's blood can wake the stone dragon. There are stone carvings of dragons at Dragonstone.
A Game of Thrones
Daenerys Targaryen, born on Dragonstone, is gifted three dragon eggs that are solid stone, fossilized over time. Daenerys hatches them into living dragons in a miraculous ritual under the red comet at the funeral pyre of her husband, Khal Drogo.
A Storm of Swords
On Dragonstone, Melisandre tells Davos Seaworth of a prophecy that when the red star bleeds and the darkness gathers, Azor Ahai shall be born again amidst smoke and salt to wake dragons out of stone, that Dragonstone is the place of smoke and salt, and that Stannis Baratheon is Azor Ahai reborn.
After the news of the Red Wedding, Melisandre beseeches Stannis to give her his nephew Edric Storm, a bastard son of the late King Robert I Baratheon, as a sacrifice so she can wake the stone dragon, but Stannis refuses. Davos wonders if the carved dragons of Dragonstone were once real dragons, somehow turned to stone by the Valyrians. Davos eventually smuggles Edric to safety aboard the Mad Prendos.
A Dance with Dragons
At the Wall, Melisandre tells Jon Snow, Lord Commander of the Night's Watch, that Stannis is Azor Ahai reborn. Jon has heard all this from her before, and reminds her that Stannis was not born on Dragonstone, but at Storm's End.
Only a king's blood can wake the stone dragon.
—thoughts of Davos Seaworth
If the red woman brings them to life, the castle will come crashing down, I am thinking. What kind of dragons are full of rooms and stairs and furniture? And windows. And chimneys. And privy shafts.
- A Storm of Swords, Chapter 36, Davos IV.
- A Storm of Swords, Chapter 54, Davos V.
- A Storm of Swords, Chapter 25, Davos III.
- A Dance with Dragons, Chapter 49, Jon X.
- A Clash of Kings, Prologue.
- A Game of Thrones, Chapter 3, Daenerys I.
- A Game of Thrones, Chapter 11, Daenerys II.
- A Game of Thrones, Chapter 72, Daenerys X.
- A Storm of Swords, Chapter 63, Davos VI.