All the Kings and Queens of Westeros
A Complete History of the 21 Kings and 2 Queens That Ruled Westeros
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The second son of Aegon V, Jaehaerys II becomes king after his father's death, since his older brother Duncan gave up the royal succession to marry a commoner. He ascends the throne at age 34, but only reigns for three years due to ill health. His reign is best known for the "War of the Ninepenny Kings," a war launched by a band of mercenaries (and some Blackfyres) looking to carve out their own kingdoms. Against his father's wishes, Jaehaerys marries his sister Shaera; he later forces his own children, Aerys and Rhaella, to also marry against their own wishes.
Jaehaerys is never a strong, healthy man, and he dies at age 37 after an illness. He is succeeded by his son Aerys.