He succeeded his brother Clotaire III in Neustria in 673, but Childeric II of Austrasia displaced him soon thereafter until he died in 675 and Theuderic retook his throne.
Ia menggantikan saudaranya Clotaire III di Neustria tahun 673, namun Childerich II dari Austrasia menggantikannya tak lama kemudian sampai ia meninggal pada tahun 675 dan Theuderic mengambil kembali takhtanya.