Tupac’s ancestor was Uenuku, the owner of the Footprint of the Rainbow, and presumably the one who founded the People of the Springs tribe.
He was known for being “built like a mountain,” and he was Tenoch’s rival until they teamed up with a group of heroes to fight the Abyss together. Sometime before that, he challenged Tenoch to a fight over the Ash-Graven Drinking Horn (and won). He later offered that drinking horn up as a sacrifice to fulfill a promise or something.
He also passed his ancient name on to Mualani.