URL:https://upload.wikimedia.org/wikipedia/commons/thumb/3/36/S._V._Ivanov._Trade_negotiations_in_the_country_of_Eastern_Slavs._Pictures_of_Russian_history._(1909).jpg/330px-S._V._Ivanov._Trade_negotiations_in_the_country_of_Eastern_Slavs._Pictures_of_Russian_history._(1909).jpg
掲載元:https://ko.wikipedia.org/wiki/노예제