According to Eliade, "eschatological myths" became prominent during the Middle Ages during "certain historical movements". These eschatological myths appeared "in the Crusades, in the movements of a Tanchelm and an Eudes de l'Etoile, in the elevation of Fredrick II to the rank of Messiah, and in many other collective messianic, utopian, and prerevolutionary phenomena". One significant eschatological myth, introduced by Gioacchino da Fiore's theology of history, was the "myth of an imminent third age that will renew and complete history" in a "reign of the Holy Spirit"; this "Gioacchinian myth" influenced a number of messianic movements that arose in the late Middle Ages.