Final answer:
Mary I's movement to restore Catholicism and undo the Protestant Reformation is known for the persecution of Protestants and is often referred to as the Marian Persecutions. Her attempts were not fully realized, and upon her death, Elizabeth I established the Church of England with a compromise between both religions.
Step-by-step explanation:
The movement led by Mary I to restore Catholicism and undo the Protestant Reformation was characterized by the intense persecution of Protestants and the execution of several hundred of them in an effort to reverse the religious changes initiated by her father, Henry VIII. However, Mary's reign ended before she could fully achieve her goal of reverting England to Catholicism. Mary I's efforts, often referred to as the Marian Persecutions, were ultimately unsuccessful as her half-sister, Elizabeth I, succeeded her and worked towards a compromise between Protestantism and Catholicism, though leaning towards Protestantism with the establishment of the Church of England, which retained some Catholic ceremonies but incorporated Protestant doctrines.