Baring-Gould’s sources: French Martyrology. Authorities:—His life by Sigebert of Gemblours, d. 1112, and mention by Gregory of Tours, and Flodoard.
This royal saint was the son of Dagobert I., King of France. The father for a long time refused to have his son baptized, but at length by the advice of S. Ouen and S. Eligius, then laymen in his court, he recalled S. Amand, bishop of Maestricht, whom he had banished for reproving his vices, and bade him baptize his son Sigebert. The young prince's education was entrusted to Pepin, mayor of the palace, who carried his charge into Aquitain, to his estates. But at the age of three, Sigebert was invested by his father with the kingdom of Austrasia, or Eastern France, including Provence, Switzerland, Bavaria, Swabia, Thuringia, Franconia, the Rhenish Palatinate, Alsace, Trèves, Lorraine, Champagne, Upper Picardy, and Auvergne.
Dagobert died in 638, and was succeeded by Clovis II., in the kingdom of Western France. Pepin of Landen, was mayor of the palace to Sigebert, and strove to train the young king in godliness and Christian virtues. By his justice and temperance, S. Sigebert rendered himself in his youth greatly beloved and respected by his subjects.
Pepin dying in 640, the king appointed Grimoald, mayor of the palace, in his father's room. The Thuringians revolting, Sigebert reduced them to their duty; and this is the only war in which he was engaged. His munificence in founding churches and monasteries, his justice in ruling, and the private virtues of his spotless life, made him to be regarded as a model of a saintly king. After a reign of eighteen years from the date of his father's death, he died at the age of twenty-five, and was buried in the abbey of S. Martin [St. Martin of Tours (d. 397), soldier turned bishop], near Metz, which he had built. His body was found incorrupt in 1063, and in 1170 it was enshrined in a silver case. When Charles V. laid siege to Metz, Francis of Lorraine, Duke of Guise, demolished all the monasteries and other buildings in the suburbs which could give harbour to the enemy, amongst others that of S. Martin. The relics [the bodily remains of a saint, or objects they used, kept with honor] of the saintly king were then removed to the collegiate church of Our Lady, at Nancy, where they repose in a magnificent shrine.
