Duke Bogislaw IV was a notable ruler of the Duchy of Pomerania during the 13th century. He was born around 1280 and became Duke in 1309, ruling alongside his brother, Duke Barnim IV. His reign was marked by efforts to strengthen the duchy's political and economic position in the region. Bogislaw IV is known for his involvement in various alliances and conflicts, particularly with the Teutonic Knights and neighboring territories. He played a significant role in the Pomeranian succession crisis, which shaped the future of the duchy and its influence in northern Europe.