"The" ceremony? 

In the "Early Years" section is, "On his way back home after the conquest of Khwarizmian Empire, Genghis Khan performed the ceremony on his grandsons Mongke and Kublai after their first hunting in 1224 near the Ili River." What ceremony? Could an expert on 13'th Century Mongolian culture maybe drop in a name, say the "manhood ceremony" or something?