Cardinal Mazarin remarked that if all the ministers of Europe were on the same boat, this person would be at the helm. For 10 points each:
[10m] Name this Swedish politician. He served as regent for Gustavus Adolphus in his absence and, after his death in battle, regent for his young daughter Christina.
ANSWER: Axel Gustafsson Oxenstierna
[10e] Oxenstierna had an important role in brokering diplomacy before and during this war. This religious conflict in the Holy Roman Empire that eventually engulfed most of Europe was ended by the Peace of Westphalia.
ANSWER: Thirty Years’ War
[10h] In Gustavus Adolphus’s absence, Oxenstierna acted as viceroy of this region. This region was conquered after the Battle of Wenden and signed over in the Truce of Plussa.
ANSWER: Livonia
<AD, European History>