Count Ramón Berenguer IV of Barcelona was a prominent medieval nobleman who ruled from 1131 to 1162. He was a member of the House of Barcelona and played a crucial role in the expansion of the County of Barcelona. His reign is noted for the consolidation of power and territorial gains, particularly through strategic marriages and military campaigns. One of his significant achievements was the conquest of Valencia in 1238, which helped to establish Christian control over the region. Ramón Berenguer IV is also remembered for his efforts to promote trade and cultural exchange, contributing to the economic development of his territories during the Reconquista.