While they were carving the west portal there came to Senlis a touching figure, the young mother of the future Louis VIII, Isabelle, daughter of Baudouin V of Flanders, who claimed direct descent from Charlemagne; through her the blood of the Carolingian line passed into the third dynasty of France. She was to die, at nineteen, almost repudiated by Philippe-Auguste, because her people declined to support one of his projects. In Senlis Cathedral this gentle grandmother of St. Louis walked barefooted, candle in hand, beseeching assistance from the Mother of God with such humility that the beholders wept. She founded a chapel in the cathedral. A few years later, in 1191, the cathedral of Senlis was consecrated by that archbishop of Sens who was Philippe-Auguste's uncle, Guillaume of Champagne, William of the White Hands, the prelate who had completed the cathedral at Sens. And there came to the dedication Bishop Nivelon de Chérisy, just starting Soissons' Cathedral; Bishop Étienne de Nemours, at work on Noyon's; the prelate of Meaux, who was raising that cathedral; and many another expert in the new art. Sometime later, Bishop Geoffrey resigned his see, and in his place was elected Pierre Guérin, chancellor of France under three kings, a figure worthy to stand beside those Gallo-Roman bishops who remained as bulwarks of society when the Roman Empire fell in pieces around them. Bishop Guérin was a man possessed by a passion for the public weal. His prudence and firmness caused Philippe-Auguste and Louis VIII to name him executor of their testaments. One of his enterprises was the organizing of the royal archives. It was he who came to Blanche of Castile to break the news of her husband's death as she rode out from Paris to meet Louis VIII returning from the southern war. For Louis IX during his minority he showed a father's affection. "He governed marvelously well the kingdom's needs," says the old chronicler, and when he died, on his grave they inscribed, "Here lies Guérin, whose life was an untiring work." In early life Guérin had, in Palestine, become a Knight Hospitalier of St. John of Jerusalem, and, as bishop, continued to wear the white habit of that military order. At the battle of Bouvines, though not an actual combatant, he exhorted the troops and directed maneuvers, for he was skilled in the strategy of war. A survey of the enemy's position made him urge Philippe-Auguste to attack at once, and the king, who knew Guérin to be _sages homs et de parfont conseil_, obeyed, thus winning the greatest victory of the century. "On that day French unity received its baptism."