Then Antigonus took possession of all the treasures in Ecbatana and Babylon, and began to call Seleucus in Syria to account for his dealings with the revenues of the empire.  Seleucus fled into Egypt; and all the four chiefs, Ptolemy, Seleucus, Lysimachus, and Cassander joined together to put down Antigonus and his brave and able son, Demetrius.  There was war everywhere, until in 311 peace was made, on condition that the Greek cities should be set free, and that Antigonus should have the whole government of Asia Minor, Seleucus of Syria, Ptolemy of Egypt, Cassander of Macedon, and Lysimachus of Thrace, till the young Alexander was old enough to govern; but, as we have seen, Cassander murdered him when he was only sixteen, and the old family of Macedon was at an end.  Nor did Cassander give up the Greek cities; so Demetrius was sent to force him to do so.  There was little attempt to resist him; and the Athenians were in such delight that they called him the Saviour, named a month after him, lodged him in the Parthenon itself, and caused his image to be carried in processions among those of the gods themselves.  He took so many towns that his name in history is Poliorketes, or the City-taker, and then he was sent to gain the isle of Cyprus from Ptolemy.  The fleet of Alexandria was thought the best in the world, but Demetrius defeated it entirely in the year 306, and in their joy the soldiers called him and his father both kings, and they put on the diadem of the Shahs of Persia, making their capital the city they had founded on the Orontes, and calling it Antigoneia.