The fall of Rouen, however, frightened John of Burgundy, and unwilling that France should fall wholly into the power of his ally King Henry, he made proposals for a reconciliation with the Dauphin and his Armagnac followers. The treacherous young prince accepted the overtures with apparent cordiality, and invited Duke John to meet him on the bridge of Montereau to settle terms of peace. But when Burgundy came to the conference, he was deliberately slain by the Armagnac captains, in the presence and with the consent of the Dauphin (August, 1419). [Sidenote: =Treaty of Troyes.=] The murder of Montereau was destined to make Henry master of France. When Philip of Burgundy, the son of Duke John, heard of his father's death, he vowed unending war against the Dauphin and his faction, and took the field to help the English to complete the conquest of France. Nor was Philip of Burgundy the only helper that Henry secured: the Queen of France, Isabella of Bavaria, bitterly hated her son the Dauphin, and was glad to do him an evil turn. She proposed that Charles should be disinherited, and that the crown should pass with her favourite daughter Catherine to the hands of the English king. So at Troyes, in Champagne, Henry, Philip of Burgundy, and Queen Isabella concluded a formal treaty by which Henry received Catherine to wife, and was to succeed to the French throne on the death of his father-in-law, the old King Charles VI., who still lingered on in complete imbecility (June 2, 1420). [Sidenote: =Henry master of Northern France.=] The treaty of Troyes put Paris and the greater part of Northern France into Henry's hands. Casting national feeling aside in their bitter partisan spirit, the Burgundian faction everywhere accepted the King of England as the lawful regent and governor of France. South of the Loire the Dauphin and his Armagnac friends still held their own, but north of it they only possessed scattered fortresses dotted about in Picardy, the Isle-de-France, and Champagne, from Boulogne in the north to Orleans in the south. After taking formal possession of Paris and holding a great meeting of the Estates of the French realm at Rouen, Henry returned in triumph to England with his young wife. He had reached a pitch of success in war such as no English king had ever attained before, and the nation, blinded by the personal merits of its king and gorged with the plunder of France, forgave him all his faults. The waste of life and money, the never-ending persecution of the Lollards, the precarious tenure of the conquests in France--due, in sober truth, merely to the aid of the Burgundian faction--were all forgotten. [Sidenote: =Defeat of the English at Beaugé.=]