[Caesar Princeps]

I would dare to say:
Caius Iulius Caesar: enlarger and founder of Roman Empire;
Saulus of Tharsus (St. Paul): who brought Christianism to Europe;
Charle Magne: he started the building of Medieval Europe;
Bernard de Clairvaux: he contributed to reform Church, preached the Crusades and founded the Templars;
Cristoforo Colombo: he started oceanic voyages, giving start to expansion and colonialism;
Martin Luther: he gave way to a new vision of Christianism, and broke in two European religious unity.
Napoleone Bonaparte: he widespred French Revolution and sowed the seeds of modernist nationalisms.
Karl Marx: the effects of his theories have became so terribly widespread...
Henry Ford: the inventor of consumism and mass capitalism.
Adolf Hitler: he stands as an unavoidable figure in last century's history;