Agariste was the daughter, and possibly the heiress, of the tyrant of Sicyon, Cleisthenes. Her father wanted to marry her to the "best of the Hellenes" and organized a competition whose prize was her hand in marriage. According to his declaration, all the eligible young men had to appear in Sicyon within 60 days. Twelve competitors appeared and Cleisthenes held a banquet in his guests' honour.