He is remembered primarily for his Chronicon sive Annales, an important historical record of his time.
Though he took part in the conspiracy against the Admiral Maio of Bari, he never fell out of favour and even performed the coronation of William II.
In 1167, as the highest-ranking prelate in the realm, he crowned William II as king in the Cathedral of Palermo.
Romuald's work at a chronicle known as Chronicon was obviously connected with his studies at the Schola Salernitanae where his family had been involved over generations.
[1] According to Massino Oldoni the preceding compilation already existed, when Romuald was a child, the earlier Norman history also does not use the third person like the portion ascribed to him.