All the Kings and Queens of Westeros That Came Before and After Aegon II

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.