Who was the king of England during a significant civil war in England when he was overthrown?

The question refers to a significant civil war in England during which the king was overthrown. The correct answer is King Charles I, who was the monarch during the English Civil War (1642-1651). This conflict arose from political, religious, and social disputes between Charles I and Parliament. The war ended with Charles I's defeat, and he was executed in 1649, marking a pivotal moment in English history.

King George III reigned during the American Revolution and is not associated with a civil war in England. King James II was overthrown during the Glorious Revolution in 1688, which was a bloodless coup rather than a civil war. King Henry VIII is notable for his role in the English Reformation and does not have any direct ties to a civil war scenario that involves his overthrow. Understanding the context of these monarchs helps clarify why King Charles I is the central figure related to the civil war in England.