Sweden's era of great power refers to a period in Swedish history, from the late 16th century to the early 18th century, when Sweden emerged as one of Europe's major powers and controlled vast territories.
Gustavus Adolphus: Gustavus Adolphus was a Swedish king who played a significant role in Sweden's era of great power. He modernized the army, implemented military reforms, and transformed it into a formidable force.
Thirty Years' War: The Thirty Years' War was a conflict that took place during Sweden's era of great power. It involved many European countries and had profound political and religious implications for Europe.
Livonia: Livonia refers to an area in present-day Estonia and Latvia that was under Swedish control during Sweden's era of great power. It was an important part of their Baltic empire.