_Seleucus_, form'd a league against _Antigonus_; and after certain wars made peace with him, _An. Nabonass._ 438, upon these conditions: that _Cassander_ should command the forces of _Europe_ till _Alexander_ the son of _Roxana_ came to age; and that _Lysimachus_ should govern _Thrace_, _Ptolemy_ _Egypt_ and _Lybia_, and _Antigonus_ all _Asia_. _Seleucus_ had possest himself of _Mesopotamia_, _Babylonia_, _Sustana_ and _Media_, the year before. About three years after _Alexander_'s death he was made governor of _Babylon_ by _Antipater_; then was expelled by _Antigonus_; but now he recovered and enlarged his government over a great part of the _East_: which gave occasion to a new _AEra_, called _AEra Seleucidarum_. Not long after the peace made with _Antigonus_, _Diodorus_ saith the same _Olympic_ year; _Cassander_, seeing that _Alexander_ the son of _Roxana_ grew up, and that it was discoursed thro'out _Macedonia_ that it was fit he should be set at liberty, and take upon him the government of his father's kingdom, commanded _Glaucias_ the governor of the castle to kill _Roxana_ and the young king _Alexander_ her son, and conceal their deaths. Then _Polyperchon_ set up _Hercules_, the son of _Alexander_ the great by _Barsine_, to be king; and soon after, at the sollicitation of _Cassander_, caused him to be slain. Soon after that, upon a great victory at sea got by _Demetrius_ the son of _Antigonus_ over _Ptolemy_, _Antigonus_ took upon himself the title of king, and gave the same title to his son. This was _An. Nabonass._ 441. After his example, _Seleucus_, _Cassander_, _Lysimachus_ and _Ptolemy_, took upon themselves the title and dignity of kings, having abstained from this honour while there remained any of _Alexander_'s race to inherit the crown. Thus the monarchy of the _Greeks_ for want of an heir was broken into several kingdoms; four of which, seated _to the four winds of heaven_, were very eminent. For _Ptolemy_ reigned over _Egypt_, _Lybia_ and _Ethiopia_; _Antigonus_ over _Syria_ and the lesser _Asia_; _Lysimachus_ over _Thrace_; and _Cassander_ over _Macedon_, _Greece_ and _Epirus_, as above. _Seleucus_ at this time reigned over the nations which were beyond _Euphrates_, and belonged to the bodies of the two first Beasts; but after six years he conquered _Antigonus_, and thereby became possest of one of the four kingdoms. For _Cassander_ being afraid of the power of _Antigonus_, combined with _Lysimachus_, _Ptolemy_ and _Seleucus_, against him: and while _Lysimachus_ invaded the parts of _Asia_ next the _Hellespont_, _Ptolemy_ subdued _Phoenicia_ and _Coelosyria_, with the sea-coasts of _Asia_.