Tertry (687): Pepin of Herstal Becomes the Kingdom’s Arbiter

The battle of Tertry (687) is a key moment: it does not replace the Merovingians yet, but it places real power in the hands of one man: Pepin of Herstal, mayor of the palace of Austrasia.

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⚔️ Why this battle matters

Before Tertry, the Frankish kingdom remains a mosaic of balances between kings and great men. After Tertry:

• Austrasia imposes its military superiority
• Neustria must negotiate with the victor
• the mayor of the palace becomes the decision centre for the whole kingdom

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👑 A king on top… and another at the helm

The Merovingians continue to exist, but the system changes:

• the king keeps dynastic and sacred prestige
• the mayor of the palace commands the army, distributes offices, and arbitrates alliances

Tertry opens the last phase: the one in which the Pippinids will, generation after generation, transform a de facto power into legal power, until the Carolingians.

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🧠 Key takeaways

• Tertry (687) marks Pippinid domination over Frankish politics.
• The mayor of the palace becomes the “true holder” of power, even if the king remains in place.