Theodebert succeeded his father, Childebert II, on the throne of Austrasia in 595 while his brother, Theodoric II, mounted that of Burgundy. After early cooperation against their cousin, Chlotar II of Neustria, whom they defeated at Dormelles (near Montereau) in 599 or 600, the brothers fell out. When Chlotar attacked Burgundy in 605, Austrasia stood aloof, and in 610 Theodebert seized Theodoric by duplicity and extorted the cession of Alsace. Theodoric responded by alliance with Chlotar and invasion; capturing Theodebert, who was childless, he delivered him to their grandmother, Brunhild, previously exiled from Theodebert's court, who forced him to become a cleric and perhaps had him murdered.


Theodobert II reigned 596-612. He was succeeded by his brother, Theodoric II (King of Burgundy, 595-613), who
reigned 612-613).