Lothaire hastily collected an assembly, which proclaimed him emperor, with the addition of divers territories to the kingdoms of Aquitaine and Bavaria: and, three months afterwards, another assembly, meeting at Compiegne, declared the Emperor Louis to have forfeited the crown, "for having, by his faults and incapacity, suffered to sink so sadly low the empire which had been raised to grandeur and brought into unity by Charlemagne and his predecessors." Louis submitted to this decision; himself read out aloud, in the church of St.Medard at Soissons, but not quite unresistingly, a confession, in eight articles, of his faults, and, laying his baldric upon the altar, stripped off his royal robe, and received from the hands of Ebbo, archbishop of Rheims, the gray vestment of a penitent.
Lothaire considered his father dethroned for good, and himself henceforth sole emperor; but he was mistaken.

For six years longer the scenes which have just been described kept repeating themselves again and again; rivalries and secret plots began once more between the three victorious brothers and their partisans; popular feeling revived in favor of Louis; a large portion of the clergy shared it; several counts of Neustria and Burgundy appeared in arms in the name of the deposed emperor; and the seductive and able Judith came afresh upon the scene, and gained over to the cause of her husband and her son a multitude of friends.

In 834, two assemblies, one meeting at St.Denis and the other at Thionville, annulled all the acts of the assembly of Compiegne, and for the third time put Louis in possession of the imperial title and power.

He displayed no violence in his use of it; but he was growing more and more irresolute and weak, when, in 838, the second of his rebellious sons, Pepin, king of Aquitaine, died suddenly.

Louis, ever under the sway of Judith, speedily convoked at Worms, in 839, once more and for the last time, a general assembly, whereat, leaving his son Louis of Bavaria reduced to his kingdom in Eastern Europe, he divided the rest of his dominions into two nearly equal parts, separated by the course of the Meuse and the Rhone.