According to the book "Before France & Germany" by Patrick J Geary, ISBN 0-19-504458-4, p 233, he married five times, Gomatrudis, Nantechildis, Regnetrudis, Vulfegundis, and Berchildis.

Dagobert I, King of the Franks, married three women in a single ceremony. Smithsonian magazine, March 1998, "The Long Good-Bye" by Barbara Holland, p. 89.

In 536 the Franks gained control of the lands of Alemannia, bounded by the Neckar, Rhine, Danube and Iller rivers. Dagobert I (d. 639) probably established dukes over the territory and commissioned for the Alemans the earliest written code to regulate their legal dealings, the Pactus alemanorum. . . About 625, Slavic tributaries revolted against the Avars and banded together under the leadership of a Frankish merchant, Samo, a trader in slaves and furs. Samo's dominion ranged over Bohemia, Moravia, Lower Austria, and Carinthia, that is, from Thurinigia to Friuli. In 631 Dagobert sought unsuccessfully to subdue Samo, probably in order to protect other merchants who followed the Danube trade route, but the 'empire' persisted until 660, when it abruptly disappeared after Samo's death. Dagobert could not, or would not, push further east to attack the Avars, and they remained fixed in central Europe until the destruction of their Ring by Charlemagne.189

After 613 the entire territorial patrimony-the realm of the Franks-was fortunate to come under the control of a single king, first Chlotar II and later Dagobert I. . . This was a period of comparative stability. By means of intimidation or diplomacy, the kings were able to hold together the disparate patchwork of Gaul with limited concessions to regional particularism.189

When Chlotar II chose to establish his ten-year-old son Dagobert at Metz, the king entrusted Arnulf with the upbringing of the young prince and the government of the realm. To share this heavy responsibility, Chlotar II named Pippin as mayor of the palace of Austrasia.189

During the personal reign of King Dagobert from 629-39, Pippin held no official post in Austrasia. Formerly his pupil, Dagobert now summoned Pippin to Neustria, where he established the political center of the realm. At the beginning of his rule, Dagobert had hoped to keep Austrasia under his direct control, but the Austrasians manifested their discontent. When Dagobert organized his campaign against Samo, the Austrasians fought with little fervor and lost. Increasingly, Austrasia was threatened by the Slavs. They had invaded Thuringia, and despite a treaty concluded by Dagobert, Saxon allies alone could not effectively protect the frontier. The wiser course was to charge the Austrasians with keeping watch over the movements of these new barbarians. Dagobert decided to follow the example of his father and make a concession to Austrasian particularism. He gave the land a king in the person of his eldest son, Sigebert, the three-year -old child of an Austrasian concubine.189

Dagobert himself had appointed that upon his death the Frankish realm should be divided in two, restoring Austrasia as a distinct kingdom, while Neustria and Burgundy passed jointly to his younger son, Clovis II.189

The monk Amandus, an Aquitainian convert to Columbanian spirituality, was consecrated bishop after a pilgrimage to Rome, but did not receive a fixed episcopal see. With the support of Dagobert, Amandus preached in northern Gaul from his monastery at Elnone, later called St. Amand.189