Toynbee, Arnold J. "If Ochus and Philip had Lived On"
Divergence: 338 BCE
What if: Artaxerxes III Ochus did not die in 338 BCE and Philip II of Macedon did not die in 336 BCE.
Summary: Surviving an assassination attempt, Philip ends up killing son Alexander, conquers Rome and pushes Ochus's Persia back to the Euphrates.
Published: In Some Problems in Greek History, Oxford University 1969.