"The werewolf might be allowed to wear Death Eater robes when they wanted to use him, but only Voldemort's inner circle were branded with the Dark Mark: Greyback had not been granted this highest honour."
—Harry Potter
—Harry Potter
Lord Voldemort placed the Dark Mark brandon his followers' inner left forearms both as a sign of their loyalty to him and as a method of summoning them to him when he desired.