The Age of Religious Reform, 1490–1648

"How Luther Went Viral," The Economist

This article and accompanying video discuss how Martin Luther’s ideas spread and draw parallels to modern social media.

"Calvinism," "In Our Time" podcast

Host Melvyn Bragg and guests discuss the ideas and impact of John Calvin.

"Holy Roman Empire," Britannica

Read more about the Holy Roman Empire from the Encyclopedia Britannica.