Non-Hellenic wisdom enjoys a high epistemic authority among ancient Platonists, and especially in the thought of Iamblichus. This is widely recognized in the scholarly literature. It is possible, however, to make finer distinctions. Using a model designed to distinguish different types of epistemic authority, I shall argue that Iamblichus attributes different degrees and types of epistemic authority to different traditions, and in different epistemic domains. This will be shown on the basis of Iamblichus’ Response to Porphyry (also known as De mysteriis) and of the Pythagorean Life.