With this object in view, he did all he could to conciliate the Catholics, while he attempted to secure the Protestants by promising to return to the principles of toleration established by his father, Maximilian. Matthias rapidly increased in popularity, and as rapidly Rhodolph was sinking into disgrace. Catholics and Protestants saw alike that the ruin of Austria was impending, and that apparently there was no hope but in the deposition of Rhodolph and the enthronement of Matthias.

It was not difficult to accomplish this revolution, and yet it required energy, secrecy and an extended combination. Even the weakest reigning monarch has power in his hands which can only be wrested from him by both strength and skill. Matthias first gained over to his plan his younger brother, Maximilian, and two of his cousins, princes of the Styrian line. They entered into a secret agreement, by which they declared that in consequence of the incapacity of Rhodolph, he was to be considered as deposed by the will of Providence, and that Matthias was entitled to the sovereignty as head of the house of Austria. Matthias then gained, by the varied arts of diplomatic bargaining, the promised support of several other princes. He purchased the coöperation of Botskoi by surrendering to him the whole of Transylvania, and all of Hungary to the river Theiss, which, including Transylvania, constitutes one half of the majestic kingdom. Matthias agreed to grant general toleration to all Protestants, both Lutherans and Calvinists, and also to render them equally eligible with the Catholics to all offices of emolument and honor. Both parties then agreed to unite against the Turks if they refused to accede to honorable terms of peace. The sultan, conscious that such a union would be more than he could successfully oppose, listened to the conditions of peace when they afterwards made them, as he had never condescended to listen before. It is indicative of the power which the Turks had at that day attained, that a truce with the sultan for twenty years, allowing each party to retain possession of the territories which they then held, was purchased by paying a sum outright, amounting to two hundred thousand dollars. The annual tribute, however, was no longer to be paid, and thus Christendom was released from the degradation of vassalage to the Turk.

Rhodolph, who had long looked with a suspicious eye upon Matthias, watching him very narrowly, began now to see indications of the plot. He therefore, aided by the counsel and the energy of the King of Spain, who was implacable in his hostility to Matthias, resolved to make his cousin Ferdinand, a Styrian prince, his heir to succeed him upon the throne. He conferred upon Ferdinand exalted dignities; appointed him to preside in his stead at a diet at Ratisbon, and issued a proclamation full of most bitter recriminations against Matthias.

Matters had now come to such a pass that Matthias was compelled either to bow in humble submission to his brother, or by force of arms to execute his purposes. With such an alternative he was not a man long to delay his decision. Still he advanced in his plans, though firmly, with great circumspection. To gain the Protestants was to gain one half of the physical power of united Austria, and more than one half of its energy and intelligence. He appointed a rendezvous for his troops at Znaim in Moravia, and while Rhodolph was timidly secluding himself in his palace at Prague, Matthias left Vienna with ten thousand men, and marched to meet them. He was received by the troops assembled at Znaim with enthusiasm. Having thus collected an army of twenty-five thousand men, he entered Bohemia. On the 10th of May, 1608, he reached Craslau, within sixty miles of Prague. Great multitudes now crowded around him and openly espoused his cause. He now declared openly and to all, that it was his intention to depose his brother and claim for himself the government of Hungary, Austria and Bohemia.

He then urged his battalions onward, and pressed with rapid march towards Prague. Rhodolph was now roused to some degree of energy. He summoned all his supporters to rally around him. It was a late hour for such a call, but the Catholic nobles generally, all over the kingdom, were instantly in motion. Many Protestant nobles also attended the assembly, hoping to extort from the emperor some measures of toleration. The emperor was so frightened that he was ready to promise almost any thing. He even crept from his secluded apartments and presided over the meeting in person. The Protestant nobles drew up a paper demanding the same toleration which Maximilian had granted, with the additional permission to build churches and to have their own burying-grounds. With this paper, to which five or six hundred signatures were attached, they went to the palace, demanded admission to the emperor, and required him immediately to give his assent to them. It was not necessary for them to add any threat, for the emperor knew that there was an Austrian and Hungarian army within a few hours' march.

While matters were in this state, commissioners from Matthias arrived to inform the king that he must cede the crown to his brother and retire into the Tyrol. The emperor, in terror, inquired, "What shall I do?" The Protestants demanded an immediate declaration, either that he would or would not grant their request. His friends told him that resistance was unavailing, and that he must come to an accommodation. Still the emperor had now thirty-six thousand troops in and around Prague. They were, however, inspired with no enthusiasm for his person, and it was quite doubtful whether they would fight. A few skirmishes took place between the advance guards with such results as to increase Rhodolph's alarm.

He consequently sent envoys to his brother. They met at Liebau, and after a negotiation of four days they made a partial compromise, by which Rhodolph ceded to Matthias, without reservation, Hungary, Austria and Moravia. Matthias was also declared to be the successor to the crown of Bohemia should Rhodolph die without issue male, and Matthias was immediately to assume the title of "appointed King of Bohemia." The crown and scepter of Hungary were surrendered to Matthias. He received them with great pomp at the head of his army, and then leading his triumphant battalions out of Bohemia, he returned to Vienna and entered the city with all the military parade of a returning conqueror.

Matthias had now gained his great object, but he was not at all inclined to fulfill his promises. He assembled the nobles of Austria, to receive from them their oaths of allegiance. But the Protestants, taught caution by long experience, wished first to see the decree of toleration which he had promised. Many of the Protestants, at a distance from the capital, not waiting for the issuing of the decree, but relying upon his promise, reëstablished their worship, and the Lord of Inzendorf threw open his chapel to the citizens of the town. But Matthias was now disposed to play the despot. He arrested the Lord of Inzendorf, and closed his church. He demanded of all the lords, Protestant as well as Catholic, an unconditional oath of allegiance, giving vague promises, that perhaps at some future time he would promulgate a decree of toleration, but declaring that he was not bound to do so, on the miserable quibble that, as he had received from Rhodolph a hereditary title, he was not bound to grant any thing but what he had received.

The Protestants were alarmed and exasperated. They grasped their arms; they retired in a body from Vienna to Hern; threw garrisons and provisions into several important fortresses; ordered a levy of every fifth man; sent to Hungary and Moravia to rally their friends there, and with amazing energy and celerity formed a league for the defense of their faith. Matthias was now alarmed. He had not anticipated such energetic action, and he hastened to Presburg, the capital of Hungary, to secure, if possible, a firm seat upon the throne. A large force of richly caparisoned troops followed him, and he entered the capital with splendor, which he hoped would dazzle the Hungarians. The regal crown and regalia, studded with priceless jewels, which belonged to Hungary, he took with him, with great parade. Hungary had been deprived of these treasures, which were the pride of the nation, for seventy years. But the Protestant nobles were not to be cajoled with such tinsel. They remained firm in their demands, and refused to accept him as their sovereign until the promised toleration was granted. Their claims were very distinct and intelligible, demanding full toleration for both Calvinists and Lutherans, and equal eligibility for Protestants with Catholics, to all governmental offices; none but native Hungarians were to be placed in office; the king was to reside in Hungary, and when necessarily absent, was to intrust the government to a regent, chosen jointly by the king and the nobles; Jesuits were not to be admitted into the kingdom; no foreign troops were to be admitted, unless there was war with the Turks, and the king was not to declare war without the consent of the nobles.

Matthias was very reluctant to sign such conditions, for he was very jealous of his newly-acquired power as a sovereign. But a refusal would have exposed him to a civil war, with such forces arrayed against him as to render the result at least doubtful. The Austrian States were already in open insurrection. The emissaries of Rhodolph were busy, fanning the flames of discontent, and making great promises to those who would restore Rhodolph to the throne. Intolerant and odious as Rhodolph had been, his great reverses excited sympathy, and many were disposed to regard Matthias but as a usurper. Thus influenced, Matthias not only signed all the conditions, but was also constrained to carry them, into immediate execution. These conditions being fulfilled, the nobles met on the 19th of November, 1606, and elected Matthias king, and inaugurated him with the customary forms.