John the Revelator (also known as John of Patmos) is a character in History that is referenced within DEXTER. John is responsible for writing the Book of Revelation and is the supposed owner of an ancient sword known as the Sword of John the Revelator. Using the Book of Revelation as reference, Travis attempts to bring about the end of the world by enacting signs depicted within John's writings. Thus far he has committed five murders as "Signs", and is attempting to bring about two final signs (Wormwood and Lake of Fire) before the End of Days.