AP European History
Emperor Charles V was the ruler of the Holy Roman Empire and King of Spain during the 16th century, reigning from 1519 to 1556. His reign was marked by vast territorial expansion and significant religious conflict, as he sought to maintain control over a sprawling empire that included territories in Europe and the Americas. Charles V's struggles with the Protestant Reformation and his efforts to unify Christendom under Catholicism had profound impacts on European society and politics during this period.