The study of Athenian history in the fifth century, and particularly in the period between the Persian and Peloponnesian Wars, derives much of its flesh and blood from inscriptions, but most inscriptions lose their full value if they cannot be dated. From the Peace of Nicias in 421 onwards it was customary to include the name of the archon in the prescript of decrees, but before the Peloponnesian War the practice was rare and random. The alliances with Egesta, Leontini and Rhegium (IG i2 19, 51, 52) were dated in this way, but not the treaty with Hermione (SEG × 15). The settlement imposed on Chalcis by Athens after the crushing of her revolt is not dated (IG i2 39), whereas earlier regulations for Miletus (IG i2 22) include the name of the archon of the year. Sometimes a single archon's name will date a whole series of records: the first tribute list, for example, is explicitly dated by archon, but the name is lost and the lists that follow are numbered only in relation to the first; the archon, however, is recorded in the thirty-fourth list, and the name is preserved, Aristion archon for 421/0, and from this we can safely infer that the first list records the payments of 454/3. Similarly the early accounts of the Parthenon, while recording the first secretary of the Boule, do not mention the archon and merely add the number in the series; but from 437/6 at least the archon's name was added, and the survival of the name of Crates, archon for 434/3, at the head of the thirteenth list enables us to date the remaining records in the series.