Rubuta ci gaba don wannan sakin layi - Wani kabari mai tarin yawa dauke da akalla gawawwakin 300 na wadanda aka kashe a wani mamayewar Mongol na Kievan Rus '
a shekara ta 1238, an gano shi a lokacin da ake tonawa a shekara ta 2005, a Yaroslavl, Rasha.