Since Peter was killed in about 69 A.D. by Nero, the emperor of Rome, if Peter is the author it was written about 65 to 69 A.D. In the letter the writer says, ("since I know that the putting off of my body will be soon, as our Lord Jesus Christ made clear to me"). Chapter 1, verse 14 Some think that the book was written by a later unnamed follower of Peter, and it could have been any time between 60 and 160 A.D. In both ancient and modern times, people have disagreed about this but the letter was finally accepted as part of the Bible by most Christians.