Welf of Altorf

  General Notes:

Welf (or Hwelf) I of Altorf (died 825) was the son of the 9th century Frankish count Rothard of Metz, to whom the sons of Charles Martel entrusted half of Alemannia. Welf was master of several counties in the southern Rhineland & Bavaria. His family became politically powerful when Louis the Pious chose his oldest daughter as his 2nd wife. Though Welf himself never became publicly prominent, his family became interwoven with the Carolingian dynasty.

He is the oldest known member of the Elder House of Welf. Welf is mentioned only once: on the occasion of the wedding of his daughter Judith with Emperor Louis the Pious in 819.
http://en.wikipedia.org/wiki/Welf_(father_of_Judith)

Welf married Duchess Hedwig of Bavaria, daughter of Isanbart and Unknown.