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How did Louis I return to the throne in 834?
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Louis I
Louis the Pious as a Christian Roman Emperor, portrait from De laudibus sanctae crucis by Rabanus Maurus.
In 833, Louis I was deposed by his eldest son, Lothar I, following a betrayal by his followers at the "Field of Lies" near Colmar.12
Louis returned to the throne in 834 primarily because Lothar overplayed his hand, which alienated his brothers and caused them to turn against him. As support for the deposed emperor grew in reaction to the mistreatment he had suffered at the hands of his sons, the shifting political tides allowed Louis to orchestrate his own restoration. Once he was freed from confinement, his weapons, his wife, and his youngest son were returned to him, and he resumed his rule as emperor.12