Then he marched beyond the Cilician gates, leaving his son Demetrius, who was about twenty-two years of age, at Gaza with an army to meet Ptolemy, who was coming from Egypt, but the latter defeated the young man badly in a battle near Gaza and compelled him to fly to his father. Ptolemy immediately sent Seleucus to Babylon to resume the government and gave him 1000 foot-soldiers and 300 horse for the purpose. With this small force Seleucus took Babylon, the inhabitants receiving him with enthusiasm, and within a short time he augmented his power greatly. Nevertheless Antigonus warded off the attack of Ptolemy and gained a splendid naval victory over him near Cyprus, in which his son Demetrius was the commander. On account of this very notable exploit the army began to call both Antigonus and Demetrius kings, as their own kings (Ardiæus, the son of Philip and Olympias, and the two sons of Alexander) were now dead. Ptolemy's army also
saluted him as king lest by inferiority of rank he should be
deemed less lofty than the victors in the late battle. Thus for these men similar consequences followed contrary events. All the others followed suit, and all the satraps became kings.