Duke John II of Schleswig was a nobleman who ruled in the late 15th century. He was born in 1459 and became Duke in 1479, governing the duchy of Schleswig in northern Germany. His reign was marked by efforts to strengthen the duchy's position and manage its relationships with neighboring territories. John II was known for his diplomatic skills and attempts to maintain peace in a region often troubled by conflicts. He was a member of the House of Oldenburg, which played a significant role in the history of Denmark and Norway. He passed away in 1513, leaving a legacy of stability in his duchy.