Multiple choice general knowledge history On which ancient civilization prophecies is the doomsday theory based Aztec Toltec Zapotec Mayan Reveal answer Fill a bubble to check yourself D Correct answer Explanation The 2012 doomsday theory originated from misinterpretations of the Mayan Long Count calendar, which completed a great cycle on December 21, 2012. This was misunderstood as predicting the world's end.