The Nuttall Encyclopedia
King of the Franks, son of Clotaire II., reformed the laws of the Franks; was the last of the Merovingian kings who knew how to rule with a firm hand; the sovereign power as it passed from his hands was seized by the mayor of the palace; d . 638.
Wood, James, ed. Entry for 'Dagobert I.'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/d/dagobert-i.html. Frederick Warne & Co Ltd. London. 1900.