The first attempt of Gustavus to win over a prince of the Empire to his side was made before Stettin, the capital of the Duke of Pomerania. He insisted on a personal interview with the aged Boguslav, the last of the old Wendish line. Boguslav had ever been on good terms with the Emperor. He had helped Wallenstein at Stralsund. But his deputies had pleaded in vain at Ratisbon for his right to retain the bishopric of Camin and for some amelioration of the misery of his subjects. He now pleaded in person with Gustavus to be allowed to remain neutral. Gustavus, like Tilly in 1623, would hear nothing of neutrality. The old man could hold out no longer. "Be it as you wish, in God's name," he said. He begged the king to be a father to him. "Nay," replied Gustavus, "I would rather be your son." The inheritance of the childless man would make an excellent bulwark for the defence of the Baltic. [Sidenote: § 3. The Elector of Brandenburg prefers neutrality.] For some time longer Gustavus was busy in securing a basis of operations along the coast by clearing Pomerania and Mecklenburg of imperialist garrisons. But, as yet, the northern princes were unwilling to support him. In vain Gustavus reasoned with the ambassador of his brother-in-law, the Elector of Brandenburg, who had come to announce his master's neutrality. "It is time," he said, "for his highness to open his eyes, and to rouse himself from his ease, that his highness may no longer be in his own land a lieutenant of the Emperor, nay, rather of the Emperor's servant. He who makes a sheep of himself is eaten by the wolf. His highness must be my friend or enemy, when I come to his frontier. He must be hot or cold. No third course will be allowed, be you sure of that." The words were thrown away for the present. There may have been something of mere cowardice in the Elector's resistance to the overtures made to him. Frederick had failed, and Christian had failed, and why not Gustavus? But there was something, too, of the old German feeling remaining, of unwillingness to join with the foreigner against the Empire. "To do so," said the Brandenburg ambassador, "would be both dishonourable and disloyal." [Sidenote: § 4. Negotiations between Sweden and France.] Gustavus had but to wait till Ferdinand's repeated blunders made loyalty impossible even with the much-enduring George William. Fortunately for Gustavus, he was now in a position in which he was able to wait a little. An attempt had been made in France to overthrow Richelieu, in which the queen mother, Mary of Medici, had taken a leading part. Richelieu, she warned her son, was leading him to slight the interests of the Church. But Lewis was unconvinced, and Mary of Medici found that all political authority was in Richelieu's hands. [Sidenote: 1631. § 5. The Treaty of Bärwalde.]