Plato, Laws 947a

προεδρίαι τʼ ἐν ταῖς πανηγύρεσι πάσαις ἔστωσαν, ἔτι δὲ τῶν εἰς τοὺς Ἕλληνας κοινῇ θυσιῶν καὶ θεωριῶν καὶ ὅσων ἂν ἑτέρων κοινωνῶσιν ἱερῶν, ἐκ τούτων τοὺς ἄρχοντας τῆς θεωρίας ἑκάστης ἐκπέμπειν, καὶ τούτους μόνους δάφνης στεφάνῳ τῶν ἐν τῇ πόλει κεκοσμημένους εἶναι, καὶ ἱερέας μὲν πάντας τοῦ Ἀπόλλωνός τε καὶ Ἡλίου, ἀρχιέρεων δὲ ἕνα κατʼ ἐνιαυτὸν τὸν πρῶτον κριθέντα τῶν γενομένων ἐκείνῳ τῷ

shall have the front seats at every festival; and from their number, too, shall be chosen the heads of every sacred mission sent out to take part in any public sacrifices, congresses or other such sacred assemblies of the Hellenes; and these alone of all the citizens shall be adorned with a crown of laurel; and they all shall be priests of Apollo and Helios, and every year that one of them who has been adjudged first of those appointed in that year shall be the high-priest, and his name they shall inscribe at the head of the year,