In 315 BC, Lysimachus joined
Cassander,
Ptolemy and
Seleucus against
Antigonus, who, however, diverted his attention by stirring up Thracian and
Scythian tribes against him. However, he managed to consolidate his power in the east of his territories, suppressing a revolt of the cities on the
Black Sea coast. In 302 BC, when the second alliance between Cassander, Ptolemy and Seleucus was made, Lysimachus, reinforced by troops from Cassander, entered Asia Minor, where he met with little resistance. On the approach of Antigonus, he retired into winter quarters near
Heraclea, marrying its widowed queen
Amastris, a Persian princess. Seleucus joined him in 301 BC and, at the
Battle of Ipsus, Antigonus was defeated and slain. Antigonus' dominions were divided among the victors. Lysimachus' share was
Lydia,
Ionia,
Phrygia and the north coast of Asia Minor. Other Feeling that Seleucus was becoming dangerously powerful, Lysimachus now allied himself with Ptolemy, marrying his daughter
Arsinoe II of Egypt. Amastris, who had divorced herself from him, returned to Heraclea. When Antigonus' son
Demetrius I renewed hostilities (297 BC), during his absence in Greece, Lysimachus seized his towns in Asia Minor, but in 294 BC concluded a peace whereby Demetrius was recognized as ruler of Macedonia. He tried to carry his power beyond the
Danube, but was defeated and taken prisoner by the
Getae king
Dromichaetes (
or Dromihete), who, however, set him free in 292 BC on amicable terms in return for Lysimachus surrendering the Danubian lands he had captured. of Lysimachus. The
Greek inscription reads:
ΒΑΣΙΛΕΩΣ ΛΥΣΙΜΑΧΟΥ "[coin] of King Lysimachus". ==Later years==