Dee ihe na-aga n'ihu maka paragraf a - Ernst August Hagen mụrụ na Königsberg, n'oge ahụ isi obodo nchịkwa nke East Prussia (na ihe fọrọ nke nta ka ọ bụrụ afọ iri mgbe 1806
mgbe eze ahụ gbapụrụ na Berlin, ebe obibi nke Ụlọikpe Prussia). Nna ya, Karl Gottfried Hagen (1749-1829) bụ ọkà mmụta ọgwụ a ma ama na onye na-ere ọgwụ n'obí eze.