I can't give a comprehensive answer on this, but a major reason why Voltaire is highly regarded in history classes is because he was highly influential in history, unlike Kant, the other example you give. read more
Freedoms and the other pillars are what that individuals like Voltaire have helped champion. Voltaire, in particular, worked tiredlessly in order to promote the concept of certain freedoms. To do such a thing in that moment in time was a revolutionary act. Perhaps, this is why Voltaire is regarded so highly. read more
Voltaire eventually earned a name for himself as a respected political and literary figure, although his early life differed significantly. Voltaire was the youngest of five children, and although bright, he had different intentions for himself than his father planned. read more