Answer
Cassander, Seleucus, Ptolemy, and Lysimachus, often referred to as the Successors or Diadochi, forged a coalition against Antigonus, a powerful general who aspired to succeed Alexander the Great as the ruler of his vast empire. This alliance, motivated by their shared ambition and desire for autonomy, emerged as a response to Antigonus' growing power and attempts to consolidate control over the territories previously conquered by Alexander.