The phrase was coined by Marshall G.S. Hodgson and his colleague William H. McNeill at the University of Chicago. Hodgson used the phrase in the title of Book 5 ("The Second Flowering: The Empires of Gunpowder Times") of his highly influential three-volume work, The Venture of Islam (1974). Hodgson saw gunpowder weapons as the key to the "military patronage states of the Later Middle Period" which replaced the unstable, geographically limited confederations of Turkic clans that prevailed in post-Mongol times.