Buddhism in Mongolia began with the Yuan emperors conversion to Tibetan Buddhism ; however , the Mongols returned to their old shamanist ways after the collapse of their empire and it was n't until the 16th and 17th centuries that Buddhism reemerged .
Buddhism in Mongolia began with the Yuan emperors conversion to Tibetan Buddhism . 
 The Mongols also returned to their old shamanist ways after the collapse of their empire and it was n't until the 16th and 17th centuries that Buddhism reemerged .