Gustavus II is known as one of Sweden's most influential and famous kings. Also called Gustav II Adolf, he was well-known for his military prowess and strategic thinking. Some of the synonyms for Gustavus II include "Gustavus the Great," "Lion of the North," and "Swedish hero." Gustavus II was known for his bravery and leadership in the Thirty Years' War against the Holy Roman Empire. Under his rule, Sweden became a major power in Europe, with a standing army and a successful economy. Gustavus II's legacy lives on today as a symbol of Sweden's past military might and strategic genius.