The 30 Years' War began as a struggle between German Protestant princes & this Catholic "Empire"
The war 
began when the newly elected Holy Roman Emperor, Ferdinand II,... [DOC] [TLE] Thirty Years' War - Facts & Summary - HISTORY.com [PAR] The Thirty Years' War (1618-48) began when Holy Roman Emperor ... religious 
and political map of central Europe, began in the Holy Roman Empire, a vast ... 
had divided Germany into hostile Protestant and Catholic camps, each prepared 
... Those German princes, mostly Calvinists, who fought against Ferdinand II in 
the... [DOC] [TLE] The 30 Years War: Catholics vs. Protestants - Video & Lesson ... [PAR] This lesson will explore the reasons for the 30 Years' War.