In Queen Victoria and the challenge of Roman Catholicism, Walter L Arnstein discusses the reaction of Queen Victoria towards Catholicism.
"Queen Victoria had mixed reactions to the challenge posed by Roman Catholicism during the 19th century. As a young princess, Victoria was an advocate of Catholic emancipation and broad religious toleration. However, she became a Protestant crusader and considered herself very anti-Catholic in the early 1870s. Towards the end of her reign, Victoria's attitude underwent a second significant transformation. Victoria's public actions and private views reflected her becoming a philo-Catholic."