The Diadochi were the successors to Alexander the Great. Upon his early and surprising death, with no obvious heir, his leading generals fought over his empire.
Diodorus Siculus, Bibliotecha Historica (Library of History)
James Romm, Ghost on the Throne: The Death of Alexander the Great and the Bloody Fight for His Empire
Robin Waterfield, Dividing the Spoils: The War for Alexander the Great's Empire
Plutarch, Parallel Lives