Rishi-kidin was the secretary to the satrap Vahauka of the Persian province of Yauna. When Mithredath arrived on his mission for Khsrish IV, Rishi-kidin was at dinner with 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. Rishi-kidin echoed Vahauka's offer of assistance and Hermippos' suggestion Mithredath explore the ruins of Athens.