Welf I of Altdorf
Carolingian Count of Argengau and Altdorf
Also called Isembart
Born (c745) – Died (before 800)

Father – Ruthard of the Argengau
Mother – Hermenlinde N

Welf was married (before 769) to Ermentrude of Vinzgau
Children : 

• Welf II of Altdorf