The trade in books was carried on by Jews long before the invention of printing. A catalogue of a bookseller of the twelfth century was unearthed a few years ago in the Fostat Genizah ("Jew. Quart. Rev." xiii. 52). The poet Immanuel of Rome (about 1300) relates that a book-seller named Aaron of Toledo traveled to Rome with 180 Hebrew manuscripts, which, however, he sold at Perugia. Although Frankfurt am Main was the main center of the book trade, Goldschmidt in Hamburg was one of the leading booksellers of the nineteenth and early twentieth century.