Bogislaw IV was a Duke of Pomerania, born around 1120. He ruled from 1160 until his death in 1187. His reign was marked by efforts to strengthen the duchy and expand its influence in the region. He was known for his alliances and conflicts with neighboring territories. During his rule, Bogislaw IV worked to consolidate power and improve the economy of Pomerania. He was involved in various military campaigns and diplomatic negotiations, which helped shape the political landscape of northern Germany. His legacy includes the continued development of Pomerania as a significant duchy in medieval Europe.