Duncan Targaryen (The Small)

Eldest son of Aegon V, sworn from the cradle to a daughter of Lord Lyonel Baratheon, and at nineteen he forsook her and the throne both to wed for love a wild-haired girl named Jenny of Oldstones. He gave up his place as heir for her, and his father let him have his happiness; he died with her, his parents, and half their court in the fire at Summerhall.