The successors of Seleukos were unable to retain hold of their remote eastern dependencies. About the middle of the third century B.C. Theodotos or Diodotos, the governor of Baktra, revolted from his grandson Antiochos II. and made Baktra an independent kingdom. Not long afterwards Aśôka, the grandson of Chandragupta, as we learn from one of his own inscriptions,[22] sent missionaries to the kings of the West to proclaim to them and to their subjects the doctrines of Buddhism. The kings named in the inscription are Antiyoka (Antiochos II., king of Syria), Turamaya (Ptolemy III., Euergetes, king of Egypt), Antigona (Antigonas Gonatas, king of Macedonia), Maga (Magas, king of Kyrênê). About the year 212 B.C. Antiochos III., surnamed the Great, marched eastward to recover Parthia and Baktria which had both revolted from the second Antiochos. He was, however, unable, even after a war which lasted for some years, to effect the subjugation of these kingdoms, and accordingly concluded a treaty with them in which he recognised their independence. With the assistance of the Baktrian sovereign Euthydêmos, who founded the greatness of the Baktrian monarchy, he made an expedition into India, where he renewed the alliance with that country which had been formed in the days of Sandrokottos. From Sophagasenos,[23] the chief of the Indian kings, he obtained a large supply of elephants, and then returned to Syria by the route through Arachôsia in the year 205 B.C. [Illustration: FIG. 7.—EUTHYDÊMOS.] [Illustration: ALEXANDER’S ROUTE IN THE PANJAB John Bartholomew & Co., Edinʳ. _NOTE:—Lines of Route shewn thus_ ——] ARRIAN ARRIAN’S ANABASIS FOURTH BOOK _Chapter XXII.—Alexander crosses the Indian Kaukasos to invade India and advances to the river Kôphên_ After capturing the Rock of Choriênês, Alexander went himself to Baktra, but despatched Krateros with 600 of the Companion Cavalry[24] and a force of infantry, consisting of his own brigade with that of Polysperchôn and Attalos and that of Alketas, against Katanês and Austanês the only chiefs now left in the country of the Paraitakênai[25] who still held out against him. In the battle which ensued Krateros after a severe struggle proved victorious. Katanês fell in the action, while Austanês was made prisoner and brought to Alexander. Of the barbarians who had followed them to the field, there were slain 120 horsemen and about 1500 foot. Krateros after the victory led his troops also to Baktra. While Alexander was here the tragic incident in his history, the affair of Kallisthenês and the pages, occurred.