Meanwhile great changes were taking place at Olympia. Its national character was recognized by the dedication in the Altis, from the spoil of Plataea, of a colossal bronze statue of Zeus, on the base of which were inscribed the names of all states which had taken part in the battles. But the new feeling of national unity found a yet worthier monument in the whole series of buildings which the new administration undertook, to render the sacred precinct worthy of its Panhellenic dignity. Hitherto, as we have seen, various states had been allowed to secure for themselves points of vantage at the festival by building, along the foot of the hill of Cronus, treasuries, or communal houses. Three more of these buildings—the last of them—were added shortly after Plataea. All these were at the western end of the terrace. One of them was dedicated by the Syracusans in commemoration of their victory over the Carthaginians at Himera; another was built by the Sicyonians, possibly on the site of an older foundation, containing the great bronze treasure-chests dedicated by Myron; the builders of the third are unknown, but it has been plausibly suggested that they were the Samians. Sicyon had played an important part in the war with Persia both by land and sea, Samos was closely connected with the victory at Mycale, and it is tempting to imagine that both these treasuries were memorials of the national victory. This, however, is mere conjecture; what is certain is, that these treasuries were built shortly after Plataea and that from this date the building of such treasuries ceases abruptly. Henceforth the Eleans took into their own hands the embellishment of the Altis, and their first work was in connexion with the treasuries.[139] The loose nature of the soil had rendered the building of the westernmost treasuries a matter of considerable difficulty. Accordingly, the Eleans constructed nine rows of stone steps extending continuously from the western end of the Heraeum along the whole length of the treasury terrace. These steps not only served as a retaining wall to the treasuries but furnished a capacious stand from which thousands of spectators could view the games and sacrifices, which still centred round the altar of Zeus. Shortly afterwards was built the additional wing of the Bouleuterion mentioned above.