Among the many adventurers brought to the surface during this troublous time in Italy, one of the most remarkable was Gian Giacomo Medequin. He had filled the office of secretary to Franeesco Sforza, Duke of Milan, and while in that capacity betrayed the duke's secrets to the French. Discovering his treachery, Sforza determined to get rid of him, and, with this view, charged him with a letter to the governor of Musso, a small fortified town situated in a remote part of the duchy at the north of the Lake of Como. Suspecting mischief, the unscrupulous Medequin opened the letter, and found that it was an order to the governor to throw him into the lake. On making this discovery, instead of seeking safety in flight, Medequin formed a plan of vengeance, and, proceeding to Musso, sought the lieutenant of the fort, to whom he delivered a letter whieh he had forged, purporting to eome from Sforza, ordering the lieutenant to arrest the governor, and commit the custody of the fort to Medequin. The forged order was obeyed, and Medequin became master of the garrison. To screen himself from the consequences of this audacious act, it was necessary that he should render some important service to the Imperial army. He resolved, therefore, to obtain possession of the Castle of Chiavenna, an important stronghold belonging to the Grisons, and lying in ambush with a sufficient force, he succeeded at last in seizing upon the governor of the place. No sooner had he secured his prey than he rode towards Chiavenna with a strong escort, and demanded to speak with the châtelaine. When she appeared on the walls, she beheld her husband, bound hand and foot, and kneeling before Medequin, who held an executioner's sword in his hand, ready to smite off the unfortunate man's head. “If you would save your husband's life, madame, you will instantly deliver up the city,” he shouted to her. “Heed not the threat,” said the captive; “I am ready to die.” “Be speedy in your decision, madame, or I strike,” cried Medequin, raising the sword. “Hold!” exclaimed the affrighted châtelaine. “I cannot see my husband perish thus. Open the gates.” So Chiavenna was delivered up. The loss of this stronghold caused great alarm to the Grisons, who were not without apprehension of further disasters, as their country was almost defenceless, the élite of their army being with François I. before Pavia. Peremptory orders were instantly sent to these men to return without delay, and in spite of all the efforts made by the king and his generals to detain them, they at once quitted the French camp. By this bold device, François was unexpectedly deprived of the services of six thousand of his troops, and at a moment when he could least spare them, while Medequin secured the protection of Pescara and Lannoy.