The Battle of Rignano represented a pivotal conflict in the power struggle between Ranulf of Apulia and Roger II of Sicily. This confrontation was part of a broader contest for control over southern Italy during a time of shifting allegiances and territorial claims. Ranulf, who had been vying for recognition and authority, found himself at the forefront of a significant military challenge posed by Roger, a formidable opponent with ambitions of consolidating power in Sicily and parts of mainland Italy.

On the day of the battle, forces loyal to Ranulf engaged Roger's troops in a decisive encounter near the town of Rignano, located in the region of Apulia. The precise tactics used during the battle are shrouded in historical ambiguity, but it is generally understood that Ranulf's strategic planning and the morale of his troops played essential roles in achieving victory. This triumph was crucial as it not only reinforced his claim as duke but also temporarily stymied Roger's ambitions, altering the political landscape of the region.

Following his victory, Ranulf of Apulia successfully maintained his dukedom for the next two years, highlighting his effective governance and military acumen. His reign marked an essential phase in the history of Apulia, where power dynamics were constantly shifting among various noble factions. The battle established Ranulf as an influential nobleman during this turbulent period, which ultimately shaped the history of Italian territories.