Most historians who accept this would derive the Popponid Babenburgs from Heinrich I von Babenburg, margrave in Friesland (Frisia), who was killed in battle near Paris on 20 August 886. His first wife was apparently an earlier Judith from the Unruoching family, daughter of the margrave Eberhard of Friuli and Gisela of Francia. Adalbert was the elder of two definite sons of this Heinrich and Judith, and was beheaded with his brother Adalhard at theres am Main on 9 September 906. Adalbert was possibly married (his wife is said to have been a Swabian lady named Brunhilda), but no children are recorded as far as I know. The only male-line descendants that are ascribed to his parents come through the _speculated_ relationship to count Heinrich, grandfather of the brothers Poppo, bishop of Würzburg and Heinrich, archbishop of Trier. Another _speculative_ sibling was Hadwig (b ca 953/5, died 24 December 903), first wife of Otto the Illustrious, duke of the Saxons, who of course has innumerable descendants. [Ref: Peter Stewart 30 Apr 2002]