When his father Sergius, of the Musco Comite family, assumed the Amalfitan throne in 958, he immediately associated his young son Manso with him.
Emperor Otto II, who was then in Italy fighting the Byzantines and the Saracens and in need of allies, gave Manso the imperial recognition he desired.
Exiled from Salerno, Manso did not find refuge in Amalfi, where his brother Adelfer had begun to reign in opposition to him.
Though Manso succeeded in reestablishing himself in Amalfi by 986, it seems that Adelfer and his other brothers, Ademarius and Leo, continued to claim co-authority until at least 998.
According to the Arab traveller Ibn Hawqal, writing in 977, described Amalfi as: ...the most prosperous Lombard city, the most noble, the most illustrious for its conditions, the most wealthy and opulent.