Bertold IV was a nobleman who held the title of Duke of Merania during the 13th century. He was part of the House of Andechs, a prominent family in medieval Germany. His reign was marked by efforts to expand his territory and influence in the region, which included parts of modern-day Austria and Slovenia. Bertold IV was born around 1210 and died in 1251. He was known for his political alliances and conflicts with neighboring rulers. His legacy includes the strengthening of the Duchy of Merania, which played a significant role in the political landscape of Central Europe during his time.