Proclus, In Theologian Platonis I 5

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ἅπασα γὰρ ἡ παρ’ Ἕλλησι θεολογία τῆς Ὀρφικῆς ἐστὶ μυσταγωγίας ἔκγονος, πρώτου μὲν Πυθαγόρου παρὰ Ἀγλαοφήμου τὰ περὶ θεῶν ὄργια διδαχθέντος, δευτέρου δὲ Πλάτωνος ὑποδεξαμένου τὴν παντελῆ περὶ τούτων ἐπιστήμην ἔκ τε τῶν Πυθαγορείων καὶ τῶν Ὀρφικῶν γραμμάτων.

For all of Greek theology is the offspring of Orphic mystical doctrine, Pythagoras having first been instructed in the rites concerning the gods by Aglaophamos, and next, Plato having received in turn perfect knowledge about these matters from the Pythagorean and Orphic writings.

Relevant guides	Orpheus