Northanger Abbey was the first of Jane Austens novels to be completed for publication, though she had previously made a start on Sense and Sensibility and Pride and Prejudice. According to Cassandra Austens Memorandum, Susan (as it was first called) was written about the years 1798–1799. It was revised by Austen for the press in 1803, and sold in the same year for £10 to a London bookseller, Crosby & Co., who decided against publishing. In 1817, the bookseller was content to sell it back to the novelists brother, Henry Austen, for the exact sum — £10 — that he had paid for it at the beginning, not knowing that the writer was by then the author of four popular novels. The novel was further revised before being brought out posthumously in late December 1817 (1818 given on the title-page), as the first two volumes of a four-volume set with Persuasion.