According to legend, the founder of House Dayne tracked a falling star to the mouth of the Torentine, and Starfall was then constructed where a magical stone was discovered. The greatsword Dawn was forged from the heart of this fallen star and has possibly been wielded by Daynes for ten thousand years. The sigil of the Daynes depicts the white sword and falling star.
The blade is as pale as milkglass, unlike dark Valyrian steel, but is similar in strength and sharpness. Unlike other houses who have ancestral swords, House Dayne does not pass its sword from lord to heir. Only a knight of House Dayne who is deemed worthy can wield Dawn, and the Sword of the Morning is envied throughout the Seven Kingdoms.
The last known user of the sword was Ser Arthur Dayne, a chivalrous knight in the Kingsguard of Aerys II Targaryen. The Smiling Knight of the Kingswood Brotherhood tried to claim Dawn from Arthur, but the robber knight was killed by the Sword of the Morning. After Arthur died in combat at the tower of joy during Robert's Rebellion, Eddard Stark rode to Starfall to deliver Dawn to Arthur's sister, Ashara Dayne.
- A Game of Thrones, Chapter 39, Eddard X.
- The World of Ice & Fire, Dorne: Kingdoms of the First Men.
- A Clash of Kings, Chapter 21, Bran III.
- A Feast for Crows, Chapter 21, The Queenmaker.
- The Citadel. Heraldry: Houses from Dorne
- The World of Ice & Fire, Dorne: The Andals Arrive.
- The World of Ice & Fire, The Targaryen Kings: Aerys II.
- A Storm of Swords, Chapter 67, Jaime VIII.
- A Game of Thrones, Chapter 6, Catelyn II.
- So Spake Martin: Valyria-related Subjects (January 01, 2002)