The opposition of Pisatis was due partly to the transference of the political centre to Elis, perhaps in a greater degree to the new régime inaugurated at Olympia. The old dual control of the festival by Elis and Pisatis was, as we have seen already, passing away; possibly its death-blow was given by the banishment of the aristocrats, some of whom may have had hereditary connexion with the festival. At all events, from the time of Plataea the two Hellanodicae who represented the dual control were replaced by a board of nine,[136] and permanent quarters were provided for the new administration by the enlargement of the Bouleuterion, the south wing of which was added about this time. The increase in the number of officials may have been rendered desirable by the increasing strenuousness of the competitions. The nine were divided into three groups of three each, in charge respectively of the horse-races, the pentathlon, and the other athletic events, an excellent arrangement which at once commends itself to the modern athletic mind. Yet it seems more likely that the number nine was dictated by political considerations, and the fact that there were nine tribes of the Eleans. It was a change to a sort of popular representation, and its popular character is further marked by the fact that these officials were elected by lot, a democratic institution which can hardly have belonged to the earlier régime. This change first took effect in Ol. 76, and possibly was introduced in view of that great national Olympiad. It was on this occasion, according to a popular story, that Themistocles himself appeared and received such an ovation from the crowd that the athletes themselves were neglected. The national character of this Olympiad assured the success of the new order. In the following festival the competition was so great that the pankration could not be decided before nightfall, and it was decided from this date to extend and rearrange the festival. In the 77th Olympiad, too, a tenth Hellanodicas was added apparently to represent the newly conquered district of Triphylia. This number remained unchanged till Ol. 103, when, the number of tribes having been raised to twelve in consequence of a still further extension of territory southwards, a corresponding change was made in the number of the Hellanodicae. The war with Arcadia which ensued reduced the number for a time to eight, but in Ol. 108 the number was restored to ten and no further change was made. These Hellanodicae must be regarded as the executive officers of the Elean Council, to whom in case of doubt or dissatisfaction there was a right of appeal.