Twenty-two years before this, Kim Hyŭk, one of the envoys to China, had there met a Westerner who is known in Korean history as Tang-yak-măng. This was one of the Jesuit priests. He came first to Canton as a missionary but his great talents were recognized in Nanking and the emperor called him to the capital and questioned him about his religion, and employed him as court astronomer. There the Koreans saw the calendar called Si-hön-yŭk. When the Ming dynasty fell the Manchus urged the Westerner to remain and they allowed him a regular salary. Kim Hyŭk brought back a book from Peking which is probably a copy or abstract of the celebrated book above mentioned. For these twenty-two years a scholar, Kim Sang-bŭm, had been studying this book, and at last having mastered its secrets, he came out with a calendar of his own. It is stated that the Westerners Yi Ma-du and Sa Su-sin had already been many years in China when Kim Hyŭk visited Nanking. (These are Ricci and Schaal). It was discovered that the country people were evading the revenue laws by cultivating the hill sides above the margin of cultivation set by law. Commissioners were sent out to remeasure the taxable land and to set limits to hillside cultivation, for it was feared that the cultivation of the hillsides would diminish the fuel supply too much. It was in this same year that the ill-fated sailing vessel Sparwehr sailed from Holland with Hendrik Hamel as super-cargo. There seem to have been sixty-four men on board, and when she went to pieces on the island of Quelpart only thirty-six of them reached shore in safety. They were taken to Seoul by the authorities and for fourteen years lived, now on the royal bounty, now by the work of their own hands, and at times they were even compelled to beg for food. At last however the remnant of them made good their escape by night and finally reached Nagasaki. Hamel afterwards wrote an account of his captivity in Korea.