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In page 303 BC:

"
  • Cassander and Lysimachus persuade Seleucus and Ptolemy to join them in trying to destroy Antigonus.[citation needed]
  • Demetrius Poliorcetes invades the Peloponnese and occupies Corinth, Sicyon, and Argos in the Peloponnese, and Achaea, Elis and almost all of Arcadia join his side.[citation needed]