"Fox's Book of Martyrs" by John Foxe is a work of Protestant history first published in 1563. This massive volume documents the sufferings of Protestants under Catholic persecution, with particular focus on England and Scotland. Created during intense religious conflict following Queen Mary I's death, the work sought to justify the English Reformation by establishing the Church of England's legitimacy as a continuation of true Christianity. The book became highly influential, shaping popular views of Catholicism that lasted for generations.
Wikipedia page about this book: en.wikipedia.org/wiki/Foxe%27s_Book_of_Martyrs