Who was responsible for launching a campaign of religious persecution in the 1550s that labeled Protestants as heretics and executed them by burning at the stake?

Explanation

Mary I of England, also known as Mary Tudor, instigated a harsh crackdown on Protestants during her reign in the 1550s, resulting in many being condemned as heretics and executed by burning at the stake. This period is often referred to as the Marian Persecutions.