In 294 B.C. he was defeated at Mantineia by Demetrius Poliorcetes, who invaded Laconia, gained a second victory close to Sparta, and was on the point of taking the city itself when he was called t So Plut.
During the Macedonian supremacy the town passed in turn from Cassander and Demetrius Poliorcetes to Antigonus Gonatas, and finally was incorporated in the Achaean League.
On the fall of Demetrius Phalereus and the restoration of the democracy by Demetrius Poliorcetes, Dinarchus was condemned to death and withdrew into exile at Chalcis in Euboea.
The chief incidents of Rhodian history during this period are a memorable siege by Demetrius Poliorcetes in 304, who sought in vain to force the city into active alliance with King Antigonus by means of his formidable fleet and artillery; a severe earthquake in 227, the damages of which all the other Hellenistic states contributed to repair, because they could not afford to see the island ruined; some vigorous campaigns against Byzantium, the Pergamene and the Pontic kings, who had threatened the Black Sea trade-route (220 sqq.), and against the pirates of Crete.
Cassander placed Athens under the virtual autocracy of Demetrius of Phalerum (317-307), and after the temporary liberation by Demetrius Poliorcetes (306-300), secured his interests through a dictator named Lachares, who lost the place again to Poliorcetes after a siege (295).
The kings after Alexander, with the exception of Demetrius Poliorcetes and Pyrrhus, are not found to have more than one legitimate wife at a time, although they show unstinted freedom in divorce and the number of their mistresses.
Five battles are recorded to have been fought near Mantineia; 418, 362 (see'above), 295 (Demetrius Poliorcetes defeats Archidamus of Sparta), 242 (Aratus beats Agis of Sparta), 207 (Philopoemen beats Machanidas of Sparta).
The "Victory of Samothrace," set up by Demetrius Poliorcetes c. 305 B.C., was discovered in the z 8 Samovar Sampierdarena island in 1863, and is now in the Louvre.
Philadelphus, but Arsinoe, disliking the projected alliance, induced Demetrius the Fair, son of Demetrius Poliorcetes, to accept the throne of Cyrene as husband of Berenice.
In 307 he returned to Athens, which had just been restored to a nominal independence by Demetrius Poliorcetes, and there he lived for the rest of his life.
In 306 Demetrius Poliorcetes won a great naval victory here over Ptolemy I.
After participating in the Lamian war and the campaigns of the Macedonian pretenders the city was captured (303) by Demetrius Poliorcetes, who transplanted all the inhabitants to the Acropolis and renamed the site Demetrias.
Then in 306 B.C. Demetrius Poliorcetes of Macedon overran the whole island, besieged Salamis, and utterly defeated there the Egyptian fleet.
ANTIGONUS GONATAS (c. 319-239 B.C.), Macedonian king, was the son of Demetrius Poliorcetes, and grandson of Antigonus Cyclops.
Demetrius Poliorcetes, the son of Antigonus, wrested part of Greece from Cassander.