To get a full view of this Europe of young men, that beheld the Reformation, we must note one other ruler farther north. Ever since the union of Colmar in 1397, Sweden had been more or less bound to Denmark, the strongest of the northern kingdoms. By the year 1520 the Danish monarch Christian had reduced the Swedes to a state of most cruel vassalage and misery. Only one young noble, Gustavus Vasa, a lad of twenty-three, still held out, and by adventures wild as those of Robin Hood evaded his enemies and at last roused his countrymen to one more revolt. It was successful, and in 1523 Gustavus, by the unanimous election of the Swedes, became the first of a new line of monarchs.[3] He proved as able as a king as he had been daring as an adventurer, and his long reign laid the foundation of Sweden's greatness in the following century. He early accepted the reformed religion, and thus it spread through the Far North almost without a check. THE REFORMATION The Reformation began in Germany in 1517, when the Saxon monk Luther--himself then only thirty-four years a sojourner upon our planet--protested against the Church's sale of indulgences. He was not alone in his protest, but only stood forth as the mouthpiece of many earnest men. His prince, that Frederick the Wise who afterward refused to be emperor, upheld him. Maximilian, dying in the early days of the dispute, had kind words of regard for the hero-monk. Even the Pope, Leo X, treated the matter amicably at first. He also was still in early life, having been made pope at thirty-six, an age quite as juvenile for the leadership of the spiritual world as that of the various temporal monarchs for theirs. Leo, being a member of the famous Medici family, was apparently more interested in art than in religion. He wanted to rebuild the gorgeous cathedral of St. Peter, and he did not want to quarrel with Germany. So also Charles V, desiring to be emperor, could scarce antagonize Frederick of Saxony, who could and did secure him his ambition. Thus in its earliest days Luther's revolt was handled very gently, and it spread with speed. Then Charles, secure upon his throne and gravely Catholic, resolved on firmer methods of stamping out the heresy. He summoned Luther to that famous interview at Worms (1521), where the reformer, threatened with outlawry and all the terror of the empire's power, refused to unsay his preaching, crying out in agony: "Here I stand! I can no other! God help me! Amen!" Charles in his shrewd, silent way saw that the matter was not to be settled so easily as he had hoped. Already half Germany was on Luther's side. Several leading nobles accompanied him as he left the Emperor's presence. Charles wanted their help against the Turks. So there was more temporizing. Then came war with Francis no tune this for quarrelling with obstinate Teutonic princes and their obstinate _protege_.