Sigebert I

Sigebert I married Brunhilda, daughter of the Visigothic king Athanagild. This marriage brought a substantial dowry and a prestigious alliance with the Visigoths, strengthening Austrasia's position against Neustria and enhancing Sigebert's prestige.

Sigebert I led a Frankish army against the Avars, who had invaded Austrasian territory. The campaign was initially successful, but Sigebert was eventually captured by the Avars. He secured his release through negotiations and payment of tribute.

Sigebert I's forces defeated Chilperic I's army near Tournai, forcing Chilperic to flee. Sigebert was on the verge of capturing Chilperic and unifying the Frankish kingdoms when he was assassinated by agents of Fredegund.

Sigebert I was assassinated at Vitry-en-Artois by two slaves wielding poisoned daggers, allegedly on the orders of Fredegund, wife of Chilperic I. His death ended his campaign against Neustria and left his young son Childebert II as king under Brunhilda's regency.