What is "ansegisel"

Ansegisel (also Ansgise, Ansegus, or Anchises) (c. 602 or 610 – murdered before 679 or 662) was the son of Saint Arnulf, bishop of Metz, and his wife Doda. He served King Sigbert III of Austrasia (634–656) as a duke ( Latin dux, a military leader) and domesticus. He was killed sometime before 679, slain in a feud by his enemy Gundewin. Through his son Pepin, Ansegisel's descendants would eventually become Frankish kings and rule over the Carolingian Empire.