In 623, he gave the kingdom of Austrasia to his young son Dagobert I. This was a political move as repayment for the support of Bishop Arnulf of Metz and Pepin I, mayor of the palace of Austrasia, the two leading Austrasian nobles, who were effectively granted semi-autonomy.

At the same time, Clothar made territorial changes by assigning the region of Reims to Neustria.
But Dagobert, now the semi-autonomous king of Austrasia, negotiated its return in 626.
In 623, he gave the kingdom of Austrasia to his young son Dagobert I. This was a political move as repayment for the support of Bishop Arnulf of Metz and Pepin I, mayor of the palace of Austrasia, the two leading Austrasian nobles, who were effectively granted semi-autonomy.
At the same time, Clothar made territorial changes by assigning the region of Reims to Neustria. But Dagobert, now the semi-autonomous king of Austrasia, negotiated its return in 626.
Chlothar II