Ermengol IV was a notable historical figure who served as the Count of Urgell from 1040 until his death in 1065. He was part of the House of Urgell, a noble family that played a significant role in the history of Catalonia. His reign was marked by efforts to consolidate power and expand his territory, as well as to strengthen the influence of the countship in the region. During his rule, Ermengol IV was involved in various military campaigns and alliances, which helped to secure his position. He is remembered for his contributions to the development of the Catalan territories and for fostering relationships with other noble families, which were crucial for maintaining stability in the region.