Mary, the fourth and penultimate monarch of the Tudor dynasty, is remembered for returning England from Protestantism to Roman Catholicism. To this end, she had almost three hundred religious dissenters executed; as a consequence, she is often known as Bloody Mary. Her religious policies, however, were in many cases reversed by her successor and half-sister, Elizabeth I. Mary Tudor was a cousin, once removed, of Mary, Queen of Scots, with whom she is often confused by those unfamiliar with British history.