The Swedish Empire achieved its peak of power during the Second Northern War, a conflict in which its main rival, Denmark-Norway, was effectively incapacitated through the Treaty of Roskilde in 1658. It was a powerful and influential European state with vast territorial holdings. During this period, Sweden emerged as a formidable military and political force, leaving a significant mark on Northern Europe and beyond. Its rise to prominence was largely underpinned by the military exploits of King Gustav II Adolph (Gustavus Adolphus), who is often regarded as one of history’s greatest military commanders.