Dagobert II (c. 650 – December 23, 679) was the king of Austrasia (676–79), the son of Sigebert III and Chimnechild of Burgundy. He is also accounted a saint by the Roman Catholic Church; his feast day is 23 December.
Dagobert II was the son of Sigibert III, an Austrasian king of the Merovingian line.
The Arnulfing mayor of the Austrasian palace, Grimoald the Elder, the son of Pippin of Landen, and Dagobert's guardian, had had his own son Childebert adopted by Sigebert III, when Sigebert was still childless. Then when Sigebert died in 656, Grimoald seized the throne for his own son and had Dagobert tonsured, thus marking him unfit for kingship, and exiled.
The tale that Dagobert was ordered to be killed and his death published about, but that he was spirited out of the country, seems to be an embellishment, perhaps developed to explain the silence of Dagobert's mother Chimnechild. She may have cooperated with Grimoald to set up Childebert the Adopted; later she hoped by marrying her daughter Bilichild to Childeric II to keep the eventual Austrasian heir in her bloodline. It has also been hypothesised that Chimnechild was not Dagobert's mother, thus her reason for abandoning him.