Ephraim Black

Ephraim Black was a Quileute chief and leader of a pack of three werewolves/shape-shifters.

Sometime during his life, a coven of vampires, the Cullen family, came to live in Washington near La Push. By nature, the werewolves and Cullens were enemies. But Ephraim was able to negotiate a peace treaty with them: as long as the Cullens didn't bite anyone or come on the Quileute's land, the werewolves wouldn't attack them or reveal them to the humans.

Ephraim's descendant, Jacob, was the one who violated the treaty Ephraim made when he revealed the Cullens are vampires to his friend Bella Swan.