Sunmaker

Sunmaker was the last Alethi king before Gavilar to unite the high princes. He began his quest to do so at the age of seventeen, and was responsible for casting down the Hierocracy. He inspired Gavilar, who revered him, but who hoped his own accomplishments wouldn't be as ephemeral as those of Sunmaker.
All Alethi people are his descendants. All houses, all ten princedoms. Their founders were his sons. Signs of his touch remain in Alethkar, but his empire didn't last even a single generation past his death.