was the son of Radelchis I
, Prince of Benevento
, and successor of
his brother Radelgar
It was given to Adelchis to preserve the ancient principality and
its independence in the face of repeated assaults by the Saracens
from the south, the Emperor Louis II
from the north, and
to the east. At first, he
was unsuccessful in his wars with the Moslems. He was defeated at
Bari in 860 and forced to make a truce with the emir and
pay a tribute.
In subsequent ventures, he was forced to call
in the help of the emperor. In 866, the emperor defeated the
Saracens and, in 871, Bari itself fell. Louis then tried to set up
greater control over all the south by garrisoning his troops in
The response of Adelchis to this action was to imprison and rob the
emperor while he was staying the princely palace at Benevento in
August. A month later, the Saracens had landed with a new invasive
force and Adelchis released Louis to lead the armies against it.
Adelchis forced Louis to vow never to reenter Benevento with an
army or to take revenge for his detention. Louis went to Rome in 872 and
was released from his oath by Pope Adrian
II on 28 May.
He tried to exact
punishment on Adelchis, but was not very successful. Adelchis
turned to the Byzantines. He was assassinated in May 878.
He was notably the last Lombard ruler to revise the Edictum Rothari
Adelchis' daughter was Ageltrude
, wife of
Guy III of Spoleto