Ramon Berenguer IV was a notable medieval nobleman, born around 1113. He served 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 was instrumental in the unification of various territories in Catalonia. Ramon Berenguer IV is also known for his marriage to Petronilla of Aragon, which helped to strengthen ties between Catalonia and the Kingdom of Aragon. His reign was marked by military campaigns against the Moors and efforts to consolidate power in the region, contributing to the growth of the Crown of Aragon.