The declining years of King Robert were embittered by the impiety of rebellious sons, who were reduced to submission only at the price of a protracted and bloody campaign in Burgundy. The broken-hearted father did not long survive his victory. He died in his palace at Melun in 1031, and the benisons and lamentations of the poor and lowly winged his spirit to its rest. If we may believe some writers, pious King Robert's memory is enshrined in the hymnology of the Church, which he enriched with some beautiful compositions: he was often seen to enter St. Denis in regal habit to lead the choir at matins, and would sometimes challenge the monks to a singing contest; once, it is said, when importuned by his queen to immortalise her name in song, he began, "O Constantia Martyrum!" The delighted Constance heard no further and was satisfied. Scarcely had the grave closed over the dead king at St. Denis when Constance plotted with some of the nobles to place Robert, her youngest and favourite son, on the throne in place of Henry, the rightful heir, who fled to Normandy to implore the aid of Duke Robert. The cultivation of the arts of peace had not enfeebled the fighting powers of the Normans. Robert fell upon the queen's supporters with reckless[43] bravery and crushed them in three decisive battles. Henry gained his crown but at the cost of a big slice of territory which advanced the Norman boundary to within twenty leagues of Paris. The queen survived her humiliation but a short time, and her death at Melun in 1032 and Henry's generosity to his enemies gave peace to the kingdom. In 1053, towards the end of Henry'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 kind of cupboard 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.