Tertullian and his “Montanist heresy”
Protestant beliefs ???
I wouldn't generalize it as "Protestant" -- having said that, there might be a small subset of charismatics who could fall within that category. But I haven't studied it so much as to be able to say definitively "this group" or "that group."
They weren't, as I understand it, an organization so much as a movement, and had different practices and prophecies at different locales, some in conflict and contradicting each other.
I don't think that's actually Protestantism, unless you want it to be.