The Battle of Tertry was an important engagement in Merovingian Gaul between the forces of Austrasia under Pepin II on one side and those of Neustria and Burgundy on the other.

[4] Historian Michael Frassetto avows that the war during which the battle of Tertry occurred, was essentially the result of a long-standing feud between Austrasian and Neustrian leaders and the civil strife within Neustria itself.

[7] Their supremacy vindicated on a battlefield, the victors forced Berchar out of office and Pepin appointed Nordebert to act on his behalf in Neustria.

[14] The repercussions of the battle were the reduction of royal authority for Neustria; the supremacy of Austrasia over the rest of the realm, characterised by later conquests to the east and the Aachen-centred Carolingian Empire; the undisputed right to rule of the Arnulfing clan,[15] Pepin even taking the title of dux et princeps Francorum or more recognizable to modern readers as "ruler of all of Francia".

[11] Pepin spent the remainder of the seventh century and the early years of the eighth-century reestablishing Frankish supremacy in Germany, during which time he forced the Frisians, Saxons, Alemanni, Suebians, Thuringians, and Bavari peoples to acknowledge their subordination to the Franks.