The Chronicum Salernitanum affirms the co-regency, however, and the principle of the indivisibility of the united Capua-Benevento as declared by Atenulf I in 900, when it says Beneventanorum principatum eius filii Pandolfum et Landulfum bifarie regebant .
communi indivisoque iure, that is "the Beneventan principality was reigned in jointly by Pandulf and Landulf under indivisible common jurisdiction."
In 967, the Emperor Otto I went to Rome and charged Pandulf with prosecuting a war against the Byzantine Empire in Apulia.
The Chronicum says Landulf tenuit principatum una cum suo germanus annos octo, that is, "held the principality solely with his brother for eight years."
Pandulf, however, cheated his nephews out of their patrimony, made himself sole prince.