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Why was the Field of Lies near Colmar given that name?
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Louis I
Louis the Pious as a Christian Roman Emperor, portrait from De laudibus sanctae crucis by Rabanus Maurus.
The site near Colmar became known as the "Field of Lies" because it was the location where Louis I (the Pious) was abandoned by his followers in 833.1
During a conflict with his three eldest sons, Louis met with Lothar I on June 30, 833, ostensibly to settle their differences. Instead, the emperor discovered he was facing a coalition of his sons, their supporters, and Pope Gregory IV. The name reflects the betrayal Louis suffered when the followers who had ostensibly gathered to negotiate turned against him, leading to his deposition and a humiliating ceremony in which he was forced to perform public penance.21