The Council of Chalon was convoked by Aega, guardian of King Clovis II, on the 24th of October. The termini post quem (647) and ante quem (653) of the council are derived from the episcopal signatures (in 647 Vulfoleudus became the metropolitan bishop of Bourges and in 654 new bishops were appointed in Lyon and Vienne). The synod was attended by six metropolitan bishops (from Lyon, Vienne, Rouen, Sens, Bourges, and Besançon), thirty three other pontiffs, and one archdeacon and five abbots representing their absent bishops. Attached to the council acts is also the letter sent by the synodal fathers to Theudorius, metropolitan bishop of Arles, in which they demote him of his episcopal rank.