The King's Ring is a historical romance novel set during the time of Gustavus Adolphus and the Thirty Years' War. Written by Zacharias Topelius and first published in 1901, the novel takes readers on a journey through the tumultuous events of the war and the lives of the people who lived through it.The story revolves around a young Swedish nobleman named Erik, who is given a mission by King Gustavus Adolphus himself. Erik must retrieve the king's...