After the battle of Ipsus, Demetrius had escaped with a few thousand men to Ephesus, where he had a fleet; and he did not altogether despair of the success of his cause. Cyprus, Sidon, and Tyre, as well as several of the Ionian towns and islands, were still in his possession, and he was anything but an insignificant man. He now displayed great skill, and drew all his forces together, with a view to establish himself in Greece, and there again to try his fortune. For he saw well, that the coalition of the generals who had invaded his father’s empire must soon break up, and that then his assistance would probably be sought by one or other of them, which was, in fact, afterwards done by Seleucus and Ptolemy. He sent the great Pyrrhus first as negotiator, and afterwards as hostage, to Ptolemy. Pyrrhus had been his companion in arms; he had lost his kingdom through Cassander, and was now wandering about in the world in the hope of conquering a kingdom for himself. The expedition of the adventurer Cleonymus also belongs to this time, or, rather, to a somewhat earlier one; he was a pretender to the throne of Sparta, from which he was, perhaps unjustly, excluded.
From Ephesus, Demetrius sailed through the Cyclades to Athens, where he wanted to establish himself first. But the Athenians were determined to avail themselves of the jealousy of the princes among each other, to secure their independence; and accordingly they sent an embassy to meet Demetrius, and declare to him, that they would not receive him.
Athens was now spared for a time, and Demetrius, before attacking the city, undertook several other expeditions. He first directed his course, with his squadron, towards the coast of Thrace, gained a footing in the Thracian Chersonesus, and made war upon Lysimachus, who, in the meantime, had taken possession of Lydia, Caria, and Phrygia. Lysimachus was not supported by the other princes, nor was it necessary, and Demetrius made no conquests there. Meantime, however, a new lucky star was rising for him through Seleucus, who, having fallen out with Ptolemy, and being dissatisfied with his share, was ready to form a friendship with Demetrius. He sued for the hand of Stratonice, a daughter of Demetrius, whom, however, he afterwards gave up to his son, Antiochus. Demetrius now sailed with his fleet to Cilicia and Syria, and, in passing, made himself master of Cilicia, and the treasures which Plistarchus, the son of Cassander, was guarding there, and then began to quarrel with Seleucus. For when Cilicia and the Phœnician cities were in the power of Demetrius, Seleucus in vain asked that they should be given up to him; and it was not without difficulty that Demetrius escaped from his plots: a formal rupture, however, did not take place. Demetrius then became reconciled with Ptolemy also, and that as we have already mentioned, through the mediation of Pyrrhus. He now again appeared in Greece, with increased forces. He gained a firm footing in Peloponnesus, though it is uncertain how many towns he subdued there.
[300-295 B.C.]
In the mean time, Cassander died, and Demetrius, supported by a newly-increased fleet, began the siege of Athens. He had then again fallen out with Ptolemy, who now sent a fleet to assist the Athenians.
Demetrius blockaded the city by land and by sea, and the Athenians, being cut off from the sea, were visited by a fearful famine. They fed upon all kinds of animals, upon indigestible herbs, and the grass which grew on the Acropolis. An Egyptian fleet, attempting to introduce provisions into Piræus, was repelled by Demetrius. At length, after an obstinate defence, they were compelled by the famine to surrender. Every catastrophe brought the city nearer its downfall, though Demetrius, considering that he was the conqueror, displayed great mildness. He convened the Athenians, without their arms, in the theatre, and surrounded the building with his hoplites. But he was satisfied with having struck them with the horrors of death, and, having reproached them for their ingratitude, he declared that he pardoned them. The Athenians were obliged at once to concede to him the right to keep garrisons at Munychia and Piræus, but otherwise they fared better under him now, than at the time when as their friend he had revelled in his excesses. He even fed the Athenians, giving them grain and other necessaries of life.