887: The Deposition of Charles the Fat

In 887, Charles the Fat’s authority collapses. In the Carolingian world, a king is not only an heir: he must be able to defend the realm, dispense justice, and hold together a coalition of great men.

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🏛️ Tribur (November 887) and Arnulf

In November 887, Charles convenes an assembly at Tribur, near Mainz. East Frankish nobles, led by Arnulf of Carinthia, deprive him of his titles. Arnulf enjoys a strong military reputation, and the rupture is justified in the name of effectiveness and protection.

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🧩 Why an emperor can fall

Charles holds many titles, but his power is vulnerable:

• an empire too vast to govern effectively;
• local elites expecting protection and arbitration;
• constant military threats (Vikings, rival princes).

The feeling that the king “does not act” or “acts badly” can break obedience.

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🏛️ A Carolingian rupture

The deposition is a key moment: it shows Carolingian unity is not guaranteed by dynasty alone. Great men can withdraw support, and sovereignty becomes more conditional.

This is not an instantaneous switch everywhere: in West Francia, succession shifts mainly after Charles’s death in 888, and some spaces (such as Lotharingia) do not follow Arnulf immediately.

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🧠 Key takeaways

• 887 marks a crisis of late Carolingian kingship.
• Power depends on coalition: without great men’s support, the king falls.
• West Francia turns toward more local, “national” choices.