Tadanmu was the general commanding the army in the Persian province of Yauna. When Mithredath arrived on his mission for Khsrish IV, Tadanmu was at dinner with the satrap Vahauka and was present when the latter invited Mithredath dine with them. After supping, Mithredath explained he was to learn more of the deeds of Khsrish I in his conquest of Yauna. Tadanmu echoed Vahauka's offer of assistance and Hermippos' suggestion Mithredath explore the ruins of Athens.