On the death of Clotaire I, Gontran received the former kingdom of Burgundians (Burgundy), he supported first his brother Sigebert facing Chilpéric, but falls out with him and suddenly takes Chilpéric's side. On the death of Chilpéric, Gontran gets closer to his nephew Childebert II (son of Sigebert) and seals with him an alliance between Burgundy and Austrasia. Gontran would possess thaumaturgical gifts.
Jurist and moderate conventional deputy, he wrote a first draft of the Civil Code in 1798, which was refused. He was appointed Second Consul in 1799, then President of the Senate and of the Council of State and contributed to the development of the Civil Code. While he had voted death to Louis XVI,
