Ephraim Black's pack

Ephraim Black's pack was the original shape-shifter group that formed a treaty with the Cullens.

History
At some point during the early 20th century, the Cullen family moved to the town of Forks near the Quileute reservation. This caused the wolf gene complex to be triggered in three members of the Quileute tribe, who phased into wolves and prepared to attack the Cullens to defend the humans in the area.

However, Carlisle Cullen, the coven leader, was able to pacify the wolves and a treaty was agreed between the two groups, in which the Cullens weren't to bite humans or trespass on the Quileutes' land and the Quileutes wouldn't reveal the vampires' existence to the humans.