Morkus from Orkus
Who ever said that being intelligent gave you personhood? No one. Aboleths and Mind Flayers are intelligent, but they're not people.
@Chaosmancer did when he included Dragons. Once you include Dragons, which aren't humanoid or even mammalian, Illithids and Aboleths are people, too. He backs it up in his response to me when he says, "But, I don't think the value in personhood can be defined by pointing to an intelligent group and saying "they aren't people"."
He has rendered personhood meaningless in D&D.