Sigebert II (601[1]–613) orSigisbert II, was the illegitimate son ofTheuderic II, from whom he inherited the kingdoms ofBurgundy andAustrasia in 613. However, he fell under the influence of his great-grandmother,Brunhilda.
Warnachar,mayor of the palace of Austrasia had Sigebert brought before a national assembly, where he was proclaimed king by the nobles over both his father's kingdoms. However, when the kingdom was invaded byClotaire II ofNeustria, Warnachar andRado, mayor of the palace of Burgundy, betrayed Sigebert and Brunhilda and joined with Clotaire, recognising Clotaire as rightful regent and guardian of Sigebert and ordering the army not to oppose the Neustrians. Brunhilda and Sigebert met Clotaire's army on theAisne, but thePatrician Aletheus, Duke Rocco, and Duke Sigvald deserted her host and Brunhilda and Sigebert were forced to flee, before being taken by Clotaire's men atLake Neuchâtel.
Brunhilda, little Sigebert and Sigebert's younger brother Corbo were executed by Clotaire's orders,[2] and Austrasia and Neustria were reunited under Clotaire's rule, who now ruled the entire kingdom of the Franks.