Adelchis was the son of Radelchis I, Prince of Benevento, and successor of his brother Radelgar in 854. Wikipedia
Died: 878 AD
Parents: Radelchis I of Benevento
Grandchildren: Lambert of Italy, Pope Stephen VI, and Ursus of Benevento
Children: Aiulf II of Benevento, Ageltruda, and Radelchis II of Benevento