▁Y idd ish ▁and ▁ 0 . 1 % ▁German ▁as ▁their ▁native ▁language . ▁ ▁References ▁ ▁Category : U ye z ds ▁of ▁Nov gor od ▁Governor ate ▁Category : Nov gor od ▁Governor ate ▁Category : D emy ans ky ▁U ye zd <0x0A> </s> ▁The ▁Ke ys ▁Hand over ▁Memorial ▁( , ▁) ▁in ▁Bel grade , ▁Ser bia , ▁marks ▁the ▁spot ▁where ▁on ▁ 6 ▁April ▁ 1 8 6 7 , ▁the ▁town ▁keys ▁of ▁the ▁several ▁Ser bian ▁for tr esses ▁were ▁given ▁to ▁Prince ▁Mih ail o ▁O br en ović ▁by ▁the ▁Ott oman ▁Tur ks . ▁That ▁moment ▁was ▁an ▁important ▁step ▁towards ▁Ser bian ▁international ▁recognition ▁at ▁the ▁Tre aty ▁of ▁Berlin ▁in ▁ 1 8 7 8 . ▁ ▁The ▁mem orial ▁was ▁declared ▁a ▁Prote cted ▁Historic ▁Land mark ▁in ▁ 1 9 9 1 , ▁and ▁it ▁is ▁protected ▁by ▁Republic ▁of ▁Ser bia . ▁ ▁History ▁The ▁Ke ys ▁Hand over ▁Memorial ▁marks ▁the ▁place ▁on ▁K alem eg dan ▁where ▁a ▁cer emon ial , ▁symbol ic , ▁hand ing ▁over ▁the ▁keys ▁of ▁Bel grade , ▁S med ere vo , ▁Š ab ac ▁and ▁K lad ovo ▁for tr esses ▁was ▁made ▁represent ▁a ▁material ▁evidence ▁which ▁indirect ly ▁express es ▁the ▁importance ▁of ▁the ▁event ▁in ▁Ser bian ▁history . ▁The ▁symbol ic ▁hand ing ▁over ▁the ▁keys ▁to ▁these ▁cities , ▁on ▁the ▁right ▁side ▁of ▁the ▁main ▁entrance ▁to ▁K alem