[5] Hence it was Aristeides who assessed the tributes of the allied states on the first occasion, two years after the naval battle of Salamis, in the archonship of Timosthenes, and who administered the oaths to the Ionians when they swore to have the same enemies and friends, ratifying their oaths by letting the lumps of iron sink to the bottom out at sea.1
1 The parties swore to keep the covenant until the iron appeared again on the surface, πρὶν ἢ τὸν μύδρον τοῦτον ἀναφῆναι Hdt. 1.165, and Hor. Epodes 16.25—“sed iuremus in haec: 'simul imis saxa renarint
vadis levata, ne redire sit nefas.'