The nineteen-volume work covered French history from Charlemagne to the outbreak of the Revolution. Michelet was one of the first historians to shift the emphasis of history to the common people, rather than the leaders and institutions of the country. Another important French historian of the period was Hippolyte Taine. He was the chief theoretical influence of French naturalism, a major proponent of sociological positivism and one of the first practitioners of historicist criticism. Literary historicism as a critical movement has been said to originate with him.