Gustavus Adolphus, also known as Gustav II Adolf (9 December 1594 – 6 November 1632), was the King of Sweden from 1611 until his death at the Battle of Lützen. He is widely regarded as one of the greatest military commanders of all time and a pivotal figure in the Thirty Years' War, which ravaged much of Central Europe. Gustavus Adolphus is often credited with modernizing the Swedish army, introducing innovative tactics and strategies that emphasized mobility, discipline, and the effective use of combined arms. His reforms and leadership significantly contributed to Sweden's rise as a major European power during the 17th century. In Swedish, he is known as Gustav II Adolf, and in German, he is referred to as Gustav Adolf von Schweden. His reign and military achievements left a lasting impact on Swedish history and the broader European political landscape.