The Pilgrim's Progress from This World to That Which Is to Come by John Bunyan is a bright example of the new Christian allegory of XVII century.

The author, son of an ordinary sheet metal worker (rather despised job that had to done by the people with the lowest social status in England), John Bunyan used to be a sinner and ribald before marriage. Only after marrying an orphan Marry, whose only heritage was two books:  Plain Man’s Pathway to Heaven by Arthur Dent and Practice of Piety by Lewis Bayly, he started his uneasy way to moral recovery. Considerably soon, Bunyan became a preacher. He was numerously chased by the authorities as well as English Church for his Christian views, baptistic in particular.

He began writing The Pilgrim's Progress from This World to That Which Is to Come in prison.  The book is questionable and contradictive but written very sincerely and persuasively. This work is probably one of the most famous allegories ever written.  The book is translated into many languages. Protestants translated often the book into different languages as the second one after the Bible.