BREAK OF DAWN

"As a boy, even I dreamed sometimes of being not a Stark of Winterfell, but a Dayne of Starfall. Legend has it that the Dornish founder of House Dayne followed a falling star to where it hit the ground. And there, he raised his castle. A fantastic story, I know, but House Dayne has a relic to prove it. Dawn. The most famous sword in Westeros."

The greatest swordsman that ever lived had a daughter. Dyanna Dayne the only child of Ser Arthur Dayne. After the death of her father Lord Eddard Stark took in the infant and raise her as his own.