Although he is only definitively mentioned in the letters of John, many associate him with "the man of sin" in Paul's 2nd Thessalonians or the beast "with seven heads and ten horns" of Revelation.  
The Patristic and Protestant "Idea" of this figure were the subject of two essays by Cardinal Newman.  In the French Jour du Judgement his parents are given as Angingnars and a woman of the Babylonian tribe of Dan.  Frederick II was a popular Medieval candidate for him and Hus and Wyclife associated him with the Pope.  Although he is only definitively mentioned in the letters of John, many associate him with "the man of sin" in Paul's 2nd Thessalonians or the beast "with seven heads and ten horns" of Revelation.  For 10 points - identify this figure from Christian mythology, a false messiah who will precede the Second Coming.
The Patristic and Protestant "Idea" of this figure were the subject of two essays by Cardinal Newman.  
The Antichrist