Janssen, op. cit. (i., a). Pastor, op. cit. (i. a). Dollinger, /Die Reformation/, 1846-8. Hergenrother-Kirsch, op. cit. (i., b). Grisar, S.J., /Luther/, 3 Bde, 1911-12 (Eng. Trans. 1913-14). Denifle-Weiss, O.P., /Luther und Luthertum in der ersten Entwicklung/, 1906-9. Weiss, /Lutherpsychologie als Schlussel zur Lutherlegende/, 2 auf., 1906. Hausrath, /Luthers Leben/, 2 Bde. 1904. Kostlin-Kawerau, /Martin Luther, Sein Leben und seine schriften/, 1903. Cardauns, /Zur Geschichte der Kirchlichen Unions --und Reformsbestrebungen von 1538-42/, 1910. Laemmer, /Monumenta Vaticana historiam ecclesiasticam saeculi XVI. illustrantia/, 1861. Raynaldus, /Annales Ecclesiastici/, 1735 (tom. xx.-xxi.). Armstrong, /The Emperor Charles V./, 1902. /Cambridge Modern History/, vol. ii. (The Reformation), 1903. Kidd, /Documents Illustrative of the Continental Reformation/, 1911. For a fairly complete bibliography on this period of history, cf. Grisar's /Luther/ (Eng. Trans., vol. i., xv.-xxv.; Cambridge Modern History, ii., pp. 728-64; Hergenrother-Kirsch, Bd. iii., pp. 4-8). The religious revolt that had been foretold by many earnest ecclesiastics began in Germany in 1517. Its leader was Martin Luther, the son of a miner, born at Eisleben in 1483. As a boy he attended school at Eisenach and Magdeburg, supporting himself by singing in the streets until a kind benefactress came to his assistance in the person of Ursula Cotta. His father, having improved his position in the world, determined to send the youth to study law at the University of Erfurt, which was then one of the leading centres of Humanism on the northern side of the Alps. But though Luther was in close touch with some of the principal classical scholars of Germany and was by no means an indifferent classical scholar himself, there is no evidence of his having been influenced largely in his religious views by the Humanist movement. He turned his attention principally to the study of philosophy, and having received his degree in 1505, he began to lecture on the physics and ethics of Aristotle.