 
 <translate> The important part for answering this question is: In Europe, the concept of banknotes was first introduced during the 13th century by travelers such as Marco Polo, with European banknotes appearing in 1661 in Sweden.
So, the answer is 1661. <ibo> Ihe dị mkpa iji zaa ajụjụ a bụ: Na Europe, ndị njem dị ka Marco Polo webatara echiche nke akwụkwọ ego na narị afọ nke 13, akwụkwọ ego ndị Europe pụtara na 1661 na Sweden. Ya mere, azịza ya bụ 1661. 