Battle of Tertry 687 • Early Middle Ages
Discovering the battle
June 687 French victory

Battle of Tertry

Frankish faides – Austrasia against Neustria and Burgundy; rise of the mayors of the palace · Tertry (Somme), between the Somme and the Omignon marshes

Summary

In June 687 at Tertry (Somme), Pepin of Herstal, mayor of the palace of Austrasia, defeated the forces of Neustria and Burgundy led by Berchar and King Theuderic III. Pepin had crossed the Somme and the Omignon marshes. Austrasian victory dictated Neustria’s political future: Berchar was removed; Pepin was recognized as mayor over Austrasia, Neustria and Burgundy, took the titles dux et princeps Francorum, without yet seizing the crown. He entrusted Neustria to Nordebert (after Berchar’s death, October 688) and betrothed his son Drogo to Anstrudis, Berchar’s widow. Tertry is a Pippinid/Carolingian turning point (Ferdinand Lot; Rosamond McKitterick), two generations before Pepin the Short.

Historical context

In the seventh century effective power passed from Merovingian kings to mayors of the palace. Austrasia (Metz, Pepin) and Neustria (Paris/Soissons, Berchar under Theuderic III) opposed each other. After Austrasian setbacks (Laon 680, Namur), a peace with Waratto (680/681) included hostages; his successors renewed the conflict. According to the Annales mettenses priores and English historiography, Theuderic III and the nobles of Neustria-Burgundy under Berchar invaded Austrasia and were routed at Tertry. Michael Frassetto sees the outcome of a long feud and Neustrian internal strife.

Tactics

Sources give little precise military detail on Tertry. Geography retained by French Wikipedia is the crossing of the Somme and the Omignon marshes, then fighting near Tertry. The Annales mettenses priores (likely written at Chelles) offer a heroic Austrasian narrative rather than an order of battle. Encirclement, surprise or Neustrian disorganization hypotheses are not detailed in the encyclopedic notices used here.

Consequences

Lasting Austrasian supremacy in the Neustria/Austrasia conflict (Lot: “from Tertry on, Austrasia was never again defeated”). Merovingian kings kept the title but lost effective power (“do-nothing kings”). Pepin dux et princeps Francorum; Drogo tied into the Neustrian Sippe via Anstrudis. Carolingian foreshadowing: still two generations until Pepin the Short (751). Sequel: Charles Martel at Néry (719) against Ragenfrid. Commemorative monument inaugurated at Tertry in 1987.

Location

Place : Tertry (Somme), between the Somme and the Omignon marshes
Coordinates : 49.8017°N, 3.0447°E

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