On Lothair's return to Italy, Wala, Jesse, and Matfrid, formerly count of Orléans, died of a pestilence. On 2nd February 835 at the palace Thionville, Louis presided over a general council to deal with the events of the previous year. Known as the Synod of Thionville, Louis himself was reinvested with his ancestral garb and the crown, symbols of Carolingian rulership. Furthermore, the penance of 833 was officially reversed and Archbishop Ebbo officially resigned after confessing to a capital crime, whilst Agobard of Lyon and Bartholmew, Archbishop of Narbonne were also deposed. Later that year Lothair fell ill; once again the events turned in Louis favour.
By his first wife, Ermengarde of Hesbaye (married ca. 794–98), he had three sons and three daughters: