On his death, the principality descended into civil war which split it permanently (except for very briefly under Pandulf Ironhead from 977 to 981).

By the Pactum Sicardi of 4 July 836, he signed a five-year armistice with the three aforementioned cities and recognised the right of travel of their merchants.

He built a new church in Benevento and to equip it with relics, rescued those of Saint Bartholomew, then in the Lipari Islands, from the Saracens by hiring some Amalfitan merchants to retrieve them.

In his capture of Amalfi, he took the relics of Saint Trofimena, recently brought there from Minori, Italy[1].

But Sicard's brother, Siconulf, whom he had imprisoned,[1] broke out and was proclaimed prince in Salerno; a ten-year civil war ensued.