Plutarch, De Iside et Osiride 28

Πτολεμαῖος δʼ ὁ Σωτὴρ ὄναρ εἶδε τὸν ἐν Σινώπῃ τοῦ Πλούτωνος κολοσσόν, οὐκ ἐπιστάμενος οὐδʼ ἑωρακὼς πρότερον οἷος τὴν μορφὴν ἦν, κελεύοντα κομίσαι τὴν ταχίστην αὐτὸν εἰς Ἀλεξάνδρειαν. ἀγνοοῦντι δʼ αὐτῷ καὶ ἀποροῦντι, ποῦ καθίδρυται, καὶ διηγουμένῳ τοῖς φίλοις τὴν ὄψιν, εὑρέθη πολυπλανὴς ἄνθρωπος ὄνομα Σωσίβιος, ἐν Σινώπῃ φάμενος ἑωρακέναι τοιοῦτον κολοσσόν, οἷον ὁ βασιλεὺς ἰδεῖν ἔδοξεν. ἔπεμψεν οὖν Σωτέλη καὶ Διονύσιον, οἳ χρόνῳ πολλῷ καὶ μόλις, οὐκ ἄνευ μέντοι θείας προνοίας , ἤγαγον ἐκκλέψαντες. ἐπεὶ δὲ κομισθεὶς ὤφθη, συμβαλόντες οἱ περὶ Τιμόθεον τὸν ἐξηγητὴν καὶ Μανέθωνα τὸν Σεβεννύτην Πλούτωνος ὂν ἄγαλμα, τῷ Κερβέρῳ τεκμαιρόμενοι καὶ τῷ δράκοντι, πείθουσι τὸν Πτολεμαῖον, ὡς ἑτέρου θεῶν οὐδενὸς ἀλλὰ Σαράπιδός ἐστιν. οὐ γὰρ ἐκεῖθεν οὕτως ὀνομαζόμενος ἧκεν, ἀλλʼ εἰς Ἀλεξάνδρειαν κομισθεὶς τὸ παρʼ Αἰγυπτίοις ὄνομα τοῦ Πλούτωνος ἐκτήσατο τὸν Σάραπιν. καὶ μέντοι Ἡρακλείτου τοῦ φυσικοῦ λέγοντος ᾍδης καὶ Διόνυσος ωὑτὸς ὅτεῳ μαίνονται καὶ ληναΐζουσιν, εἰς ταύτην ὑπάγουσι τὴν δόξαν. οἱ γὰρ ἀξιοῦντες ᾍδην λέγεσθαι τὸ σῶμα τῆς ψυχῆς οἷον παραφρονούσης καὶ μεθυούσης ἐν αὐτῷ, γλίσχρως ἀλληγοροῦσι. βέλτιον δὲ τὸν Ὄσιριν εἰς ταὐτὸ συνάγειν τῷ Διονύσῳ, τῷ τʼ Ὀσίριδι τὸν Σάραπιν, ὅτε τὴν φύσιν μετέβαλε, ταύτης τυχόντι τῆς προσηγορίας. διὸ πᾶσι κοινὸς ὁ Σάραπίς ἐστι, ὡς δὴ τὸν Ὄσιριν οἱ τῶν ἱερῶν μεταλαβόντες ἴσασιν.

Ptolemy Soter saw in a dream the colossal statue of Pluto in Sinope, not knowing nor having ever seen how it looked, and in his dream the statue bade him convey it with all speed to Alexandria. He had no information and no means of knowing where the statue was situated, but as he related the vision to his friends there was discovered for him a much travelled man by the name of Sosibius, who said that he had seen in Sinopê just such a great statue as the king thought he saw. Ptolemy, therefore, sent Soteles and Dionysius, who, after a considerable time and with great difficulty, and not without the help of divine providence, succeeded in stealing the statue and bringing it away. When it had been conveyed to Egypt and exposed to view, Timotheus, the expositor of sacred law, and Manetho of Sebennytus, and their associates, conjectured that it was the statue of Pluto, basing their conjecture on the Cerberus and the serpent with it, and they convinced Ptolemy that it was the statue of none other of the gods but Serapis. It certainly did not bear this name when it came from Sinope, but, after it had been conveyed to Alexandria, it took to itself the name which Pluto bears among the Egyptians, that of Serapis. Moreover, since Heracleitus the physical philosopher says, The same are Hades and Dionysus, to honour whom they rage and rave, people are inclined to come to this opinion. In fact, those who insist that the body is called Hades, since the soul is, as it were, deranged and inebriate when it is in the body, are too frivolous in their use of allegory. It is better to identify …