Philip of Macedon and Alexander the Great
Premise 1: In creating the phalanx, lengthening the sarissa (so that the hoplites as far back as five rows could still reach their enemies) and simultaneously increasing the armor and mobility of the hoplites, Philip of Macedon made his army a far more effective force.
Premise 2: In uniting most of Greece beneath him, Philip bequeathed to Alexander the resources of an empire to draw upon.
Premise 3: In placing Alexander under the tutelage of Aristotle (among others), Philip gave him the advantage of a brilliantly honed logical mind.
Premise 4: In his Imperialistic mentality and ruthless dealings with his enemies, Philip set the example for Alexander to follow.
Conclusion: Were it not for Philip of Macedon?s influence and the changes that he implemented, Alexander could not have swept the known world in the way that he did.