When Dagobert’s first wife died in 670 and Saint Wilfred, Bischop of York, (his spiritual advisor) was swift to ensure that Dagobert’s next wife was chosen with care. She was Gisèle de Razes, the daughter of the Count of Razes and the niece of King Wamba of the Visigoths. This alliance between the Merovingians and the Visigoths would have brought most of France under the same rule.

Wilfred was very keen to bring the Celtic and Roman churches together, which both sides had agreed upon at the Council of Whitby in 664. However, it seems that Wilfred also recognized the valuable potential of Dagobert – the rightful King of Austrasia – returning to France and reclaiming the land as the representative of the Church.

They married at the church of St. Magdalene in Rennes-le-Château. Having had four daughters through his two marriages, Dagobert now also became father to a son in 676 – Sigisbert IV.

Dagobert’s and  Gisèle’s son, Sigisbert, is the ancestor of Guillem de Gellone, ruler of the Jewish Kingdom of Septimania in southern France and later of Godfroi de Bouillon, who captured Jerusalem during the Crusades. 

While hunting in the forest of Ebersheim, Sigebert saw himself attacked by a wild boar of enormous size which the hunters pursued. The young prince, isolated at this time from the other hunters, could not contain his frightened horse at the sight of the furious beast: his mount reared up, the rider lost saddle, was trampled under the feet of the fiery animal and left for dead on the ground. In their great distress, the royal family appealed to Bishop Arbogast who immediately came to Rouffach, began to pray and gave life to the heir to the Frankish throne.

Full of gratitude, the King and his Queen Gisèle ceded to the Church of Strasbourg, the castle of Isenbourg with the surrounding domains, which consequently constituted the “Haut Mundat”. This was the origin of the temporal sovereignty of the bishops of Strasbourg. 

King Dagobert II, the thirteenth King of Austrasia, was threatened by Ebroïn, who was Mayor of the palace to Thierry, King of Neustria. Ebroïn administered Neustria unchecked and he wanted to seize Austrasia as well.

Dagobert II was killed (murdered) during a hunting trip close to his summer Palace in Stenay on December 23 in 679.

 When Giselle  heard about the murder she cursed the Catholic Church and made a prophecy that the Merovingian Dynasty would return in the future and that this will result in the eclipse of the Roman Catholic Church and diminish its prestige in the world. 

After the murder of his father Sigebert had to hide to save himself, according to legend his sister helped him to a safe place.

Sigebert IV arrived in Razes on the 17 of January 681 A.D. where he took refuge with his grandfather, there are fragments of evidence of Sigisbert’s stay in Rennes-le-Château, a charter, dated 718, which pertains to the foundation of a monastery a few miles from Rennes-le-Chateau by “Sigebert, Comte de Rhedae and his wife, Magdala’.