The Xiong Nu may not have been Mongol , but Tengri is common to several Siberian peoples including the Mongols .
The sky god Tengri is attested from the Xiongnu of the 2nd century BC .
The Xiongnu   may not have been Mongol , but Tengri is common to several Siberian peoples including the Mongols .
The sky god Tengri is attested from the Xiongnu of the 2nd century BC .