Xenophon Hellenica 3.1.6

[6] When, however, the men who had made the march up country with Cyrus joined forces with him after their safe return, from that time on he would draw up his troops against Tissaphernes even on the plains, and he got possession of cities, Pergamus by voluntary surrender, and likewise Teuthrania and Halisarna, ¹ two cities which were under the rule of Eurysthenes and Procles, the descendants of Demaratus the Lacedaemonian; and this territory had been given to Demaratus by the Persian king ² as a reward for accompanying him on his expedition against Greece. Furthermore, Gorgion and Gongylus gave in their allegiance to Thibron, they being brothers, one of them the ruler of Gambrium and Palaegambrium, the other of Myrina and Grynium; and these cities also were a gift from the Persian king to the earlier Gongylus, because he espoused the Persian cause,—the only man among the Eretrians who did so,—and was therefore banished.