These two survivors of the forty years' conflict soon entered upon the crowning fight, and in 281 Lysimachus fell in the battle of Corupedion (in Lydia), leaving Seleucus virtually master of the empire.
Feeling that Seleucus was becoming dangerously great, he now allied himself with Ptolemy, marrying his daughter Arsin06.
Whilst Antigonus was occupied in the west, Seleucus during nine years (311-302) brought under his authority the whole eastern part of Alexander's empire as far as the Jaxartes and Indus.
Bevan, House of Seleucus (1902), and the earlier literature of the subject there cited.
Antiochus had spent his youth at Rome as a hostage, and the death of Seleucus found him filling the office of war minister at Athens.
It was so named by Seleucus Nicator, after Apama, his wife.
The unpopularity of Lysimachus after the murder of Agathocles gave Seleucus an opportunity for removing his last rival.
Master of Babylonia, Seleucus at once proceeded to wrest the neighbouring provinces of Persis, Susiana and Media from the nominees of Antigonus.
Antigonus never succeeded in reaching Macedonia, although his son Demetrius won Athens and Megara in 307 and again (304-302) wrested almost all Greece from Cassander; nor did Antigonus succeed in expelling Ptolemy from Egypt, although he led an army to its frontier in 306; and after the battle of Gaza in 312, in which Ptolemy and Seleucus defeated Demetrius, he had to see Seleucus not only recover Babylonia but bring all the eastern provinces under his authority as far as India.
In 284 Arsinoe, desirous of gaining the succession for her sons in preference to Agathocles (the eldest son of Lysimachus), intrigued against him with the help of her brother Ptolemy Ceraunus; they accused him of conspiring with Seleucus to seize the throne, and he was put to death.