Raymond Berengar IV was a prominent medieval nobleman who ruled as the Count of Barcelona from 1131 until his death in 1162. He played a significant role in the expansion of the County of Barcelona and the consolidation of power in the Crown of Aragon. His reign was marked by military campaigns against the Moors in Spain and efforts to strengthen the region's political alliances. In addition to his military achievements, Raymond Berengar IV is known for his marriage to Petronilla of Aragon, which helped unite the County of Barcelona with the Kingdom of Aragon. This union laid the groundwork for the future Crown of Aragon, significantly influencing the political landscape of the Iberian Peninsula.