833: The \"Field of Lies\"

The “Field of Lies” (Campus Mendacii) is the name given by the sources to a dramatic moment of the Carolingian civil war. In June 833, Louis the Pious is abandoned by many supporters and forced to submit to his sons.

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🏟️ An army that dissolves

Lothair returns from Italy with an army and joins his brothers against their father. Pope Gregory IV is present, showing how religious authority can weigh on imperial politics.

On the field, Louis’s allies abandon him one after another. The emperor, isolated, cannot fight.

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👑 Deposition and humiliation

After the surrender, Judith is taken away and Charles is placed in the monastery of Prüm.

In November 833, at Soissons, Louis undergoes a public penance and is forced to abdicate imperial dignity.

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🔁 A reversal

The story does not end there: the princes cannot maintain durable unity, coalitions shift again, and Louis is restored as emperor the following year.

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🧠 Key takeaways

• The “Field of Lies” is less a battle than a collapse of loyalties.
• It shows how imperial power depends on aristocratic and ecclesiastical support.
• It foreshadows the long disintegration of Carolingian unity.