Myrcella Baratheon

Born in 290 AC, Cersei and Jaime's only daughter — believed, like her brothers, to be Robert's — Myrcella was by most accounts the sweetest-tempered of Cersei's children, sheltered from much though not all of Joffrey's cruelty at court. She was betrothed to Trystane Martell of Dorne as part of Tyrion's peace-brokering during his Handship, and sent south under the guard of Ser Arys Oakheart of the Kingsguard — a departure that, as it happened, pulled her clear of King's Landing just before the worst of the war reached the capital, arguably the luckiest thing to happen to any of Cersei's children.

Myrcella thrived in Dorne rather more than she ever had in King's Landing, growing genuinely fond of Trystane and of Dorne's more relaxed customs, and mastered cyvasse well enough to beat her betrothed at his own favored game — small, deliberate details the text uses to sketch a happier girl than the one who sailed south.

That peace was shattered when Ser Gerold Dayne, acting on motives of his own, ambushed her escort and cut away part of her ear before Areo Hotah and Trystane's household guard drove him off; Ser Arys Oakheart died defending her in the same attack. As the published books end, Myrcella is being sent back toward King's Landing by ship, her wound healing and her future entirely unsettled.