Pausanias Description of Greece 1.6.2

[2]
  ¹ The Macedonians consider Ptolemy to be the son of Philip, the son of Amyntas, though putatively the son of Lagus, asserting that his mother was with child when she was married to Lagus by Philip. And among the distinguished acts of Ptolemy in Asia they mention that it was he who, of Alexander's companions, was foremost in succoring him when in danger among the Oxydracae. After the death of Alexander ² , by withstanding those who would have conferred all his empire upon Aridaeus, the son of Philip, he became chiefly responsible for the division of the various nations into the kingdoms.

[2] 32

The Macedonians consider Ptolemy to be the son of Philip, the son of Amyntas, though putatively the son of Lagos, asserting that his mother was pregnant when she was married off to Lagos by Philip. And among the distinguished acts of Ptolemy in Asia they mention that it was he who, of all the companions of Alexander, was foremost in helping him when in danger among the Oxydrakai. After the death of Alexander, 33

by withstanding those who would have conferred all his empire [ arkhē] upon Aridaios, the son of Philip, he became chiefly responsible for the division of the various nations [ ethnē] into the kingdoms [ basileiai].