Gustavus Adolphus, also known in English as Gustav II Adolf or Gustav II Adolph, was the King of Sweden from 1611 to 1632, and is credited for the founding of Sweden as a great power. He led Sweden to military supremacy during the Thirty Years' War, helping to determine the political as well as the religious balance of power in Europe. He was formally and posthumously given the name Gustavus Adolphus the Great by the Riksdag of the Estates in 1634.
He is often regarded as one of the greatest military commanders of all time, with innovative use of combined arms. His most notable military victory was the Battle of Breitenfeld. With a superb military machine, good weapons, excellent training, and effective field artillery, backed by an efficient government that could provide necessary funds, Gustavus Adolphus was poised to make himself a major European leader. He was killed a year later, however, at the Battle of Lützen. He was assisted in his efforts by Count Axel Oxenstierna, the Lord High Chancellor of Sweden, who also acted as regent after his death.