This apparent victory in the Newton Wars of the 1730s and 1740s allowed Voltaire’s new philosophical identity to solidify. Especially crucial was the way that it allowed Voltaire’s outlaw status, which he had never fully repudiated, to be rehabilitated in the public mind as a necessary and heroic defense of philosophical truth against the enemies of error and prejudice. From this perspective, Voltaire’s critical stance could be reintegrated into traditional Old Regime society as a new kind of legitimate intellectual martyrdom. Since Voltaire also coupled his explicitly philosophical writings and polemics during the 1730s and 1740s with an equally extensive stream of plays, poems, stories, and narrative histories, many of which were orthogonal in both tone and content to the explicit campaigns of the Newton Wars, Voltaire was further able to reestablish his old identity as an Old Regime man of letters despite the scandals of these years. In 1745, Voltaire was named the Royal Historiographer of France, a title bestowed upon him as a result of his histories of Louis XIV and the Swedish King Charles II. This royal office also triggered the writing of arguably Voltaire’s most widely read and influential book, at least in the eighteenth century, Essais sur les moeurs et l’esprit des nations (1751), a pioneering work of universal history. The position also legitimated him as an officially sanctioned savant. In 1749, after the death of du Châtelet, Voltaire reinforced this impression by accepting an invitation to join the court of the young Frederick the Great in Prussia, a move that further assimilated him into the power structures of Old Regime society.