In 1053, towards the end of Henry I.'s almost unchronicled reign, an alarming rumour came to Paris. The priests of St. Ermeran at Ratisbon claimed to have possession of the body of St. Denis, which they alleged had been stolen from the abbey in 892 by one Gisalbert. The loss of a province would not have evoked livelier emotion, and Henry at once took measures to convince France and Christendom that the true body was still at St. Denis. Before an immense concourse of bishops, abbots, princes and people, presided over by the king, his brother and the archbishops of Rheims and of Canterbury, the remains of St. Denis and his two companions were solemnly drawn out of the silver coffers in which they had been placed by Dagobert, together with a nail from the cross and part of the crown of thorns, all locked with two keys in a chest richly adorned with gold and precious stones, and preserved in a vault under the high altar. After having been borne in procession they were exposed on the high altar for fifteen days and then restored to their resting-place. The stiff-necked priests of Ratisbon, fortified with a papal bull of 1052, still maintained their claim to the possession of the body, but no diminution was experienced in the devotion either of the French peoples or of strangers of all nations to the relics at St. Denis.

The chief architectural event of Henry's reign at Paris was the rebuilding on a more magnificent scale of the Merovingian church and abbey of St. Martin in the Fields (des Champs), whose blackened walls and desolate lands were eloquent of the Norman terror. The buildings stood outside Paris about a mile beyond the Cité on the great Roman road to the north, where St. Martin on his way to Paris healed a leper. The foundation, which soon grew to be one of the wealthiest in France, included a hostel for poor pilgrims endowed by Philip I. with a mill on the Grand Pont, to which the monks added the revenue from an oven.[41] In the eighteenth century, when the monastery was secularised, the abbot was patron of twenty-nine priories, three vicarates and thirty-five parishes, five of which were in Paris. Some of the old building has been incorporated in the existing Conservatoire des Arts et Métiers. The Gothic Priory chapel, with its fine twelfth-century choir, is used as a machinery-room, and the refectory, one of the most precious and beautiful creations attributed to Pierre de Montereau, is now a library.

Philip I. brought to the indolent habit inherited from his father a depraved and vicious nature. After a regency of eight years he became king at the age of fifteen, and lived to defile his youth and dishonour his manhood by debauchery and adultery, simony and brigandage. Early in his career he followed the evil counsels of his provost Étienne, and purposed the spoliation of the treasury of St. Germain des Prés to pay for his dissolute pleasures. "As the sacrilegious pair," says the chronicler, "drew near the relics, Étienne was smitten with blindness and the terrified Philip fled."

Philip after a reign void of honour or profit to France left his son Louis VI. (the Lusty) a heritage of shame, a kingdom reduced to little more than a baronage over a few comtés, whose cities of Paris, Etampes, Orleans and Sens were isolated from royal jurisdiction by insolent and rebellious vassals. Many of the great seigneurs were but freebooters, living by plunder. The violence and lawlessness of these and other smaller scoundrels, who levied blackmail on merchants and travellers, made commerce almost impossible. Corruption, too, had invaded many of the monasteries and fouled the thrones of bishops, and a dual effort was made by king and Church to remedy the evils of the times. The hierarchy strove to centralise power at Rome that the Church might be purged of wolves in sheep's clothing: the Capetian monarchs to increase their might at Paris in order to subdue insolent and powerful vassals to law and obedience.

In 1097 the Duke of Burgundy learned that Archbishop Anselm of Canterbury was about to pass through his territory with a rich escort on his way to Rome. The usual ambush was laid and the party were held up. As the duke hastened to spoil his victims, crying out—"Where is the archbishop?" he turned and saw Anselm, impassive on his horse, gazing sternly at him. In a moment the savage and lawless duke was transformed to a pallid, stammering wretch with downcast eyes, begging permission to kiss the old man's hand and to offer him a noble escort to safeguard him through his territory. It was the moral influence of prelates such as this and monks such as St. Bernard that enabled the hierarchy to enforce the celibacy of the clergy, to cleanse the bishoprics and abbeys, to wrest the privilege of conferring benefices from lay potentates and feudal seigneurs who bartered them for money, and to make and unmake kings.

The end of the eleventh and the beginning of the twelfth centuries saw the culmination of the power of the reformed orders. All over France, religious houses—the Grande Chartreuse, Fontevrault, Cîteaux, Clairvaux—sprang up as if by enchantment. Men and women of all stations and classes flocked to them, a veritable host of the Lord, "adorning the deserts with their holy perfection and solitudes by their purity and righteousness."

St. Bernard, the terror of mothers and of wives, by his austerity, his loving-kindness,[42] his impetuous will and masterful activity, his absolute faith and remorseless logic, his lyric and passionate eloquence, carried all before him and became the dictator of Christendom. He it was who with pitying gesture as of a kind father, his eyes suffused with tender joy, received Dante from the hands of Beatrice in the highest of celestial spheres, and after singing the beautiful hymn to the Virgin, led him to the heaven of heavens, to the very ecstasy and culmination of beatitude in the contemplation and comprehension of the triune God Himself. But religious no less than seculars are subdued by what they work in. Already in the tenth century Richer complained that the monks of his time were beginning to wear rich ornaments and flowing sleeves, and with their tight-fitting garments[43] looked like harlots rather than monks.

In the polluting atmosphere of Philip's reign matters had grown worse. St. Bernard denounced the royal abbey of St. Denis as "a house of Satan, a den of thieves." "The walls of the churches of Christ were resplendent with colour but His poor were naked and left to perish; their stones were gilded with the money of the needy and wretched to charm the eyes of the rich."

In 1095 the task of cleansing the Abbey of St. Maur des Fossés at Paris seemed so hopeless, that the abbot resigned in despair rather than imperil his soul, and a more resolute reformer was sought. In 1107 the bishop of Paris was commanded by Rome to proceed to the abbey of St. Eloy and extirpate the evils there flourishing, for the nuns, it was reported, had so declined in grace, owing to the proximity of the court and intercourse with the world, that they had lost all sense of shame and lived in open sin, breaking the bonds of common decency. The scandal was so great that the bishop determined to cut them off from the house of the Lord; the abbey was reduced to a priory and given over to the abbot of the now reformed monastery of St. Maur, and its vast lands were parcelled out into several parishes.[44] The rights of the canons of Notre Dame were to be maintained; on St. Eloy's day the abbot of St. Maur was to furnish them with six pigs, two and a half measures of wine and three of fine wheat, and on St. Paul's day with eight sheep, the same quantity of wine, six crowns and one obole. The present Rue de la Cité and the Boulevard du Palais give approximately the east and west boundaries of the suppressed abbey, part of whose site is now occupied by the Prefecture de Police.

But the way of the reformer is a hard one. At the Council of Paris, 1074, the abbot of Pontoise was severely ill-treated for supporting, against the majority of the Council, the pope's decrees excluding married clerics from the churches, and the reform of the canons of Notre Dame led to exciting scenes. Bishop Stephen of Senlis was sent in 1128 to introduce the new discipline, but the archdeacons and canons, supported by royal favour, resisted, and Bishop Stephen was stripped of his revenues and hastened back to his metropolitan, the archbishop of Sens. The archbishop laid Paris under interdict and the influence of St. Bernard himself was needed to compose the quarrel.