The Emperor Shun Chih was succeeded by his third son, known by his year-title as K'ang Hsi (lasting prosperity), who was only eight years old at the time of his accession. Twelve years later the new monarch took up the reins of government, and soon began to make his influence felt. Fairly tall and well proportioned, he loved all manly exercises, and devoted three months annually to hunting. Large bright eyes lighted up his face, which was pitted with smallpox. Contemporary observers vie with one another in praising his wit, understanding, and liberality of mind. He was not twenty when the three feudatory princes broke into open rebellion. Of these, Wu San-kuei, the virtual founder of the dynasty, who had been appointed in 1659, was the chief; and it was at his instigation that his colleagues who ruled in Kuangtung and Fuhkien determined to throw off their allegiance and set up independent sovereignties. Within a few months, K'ang Hsi found vast portions of the empire slipping from his grasp; but though at one moment only the provinces of Chihli, Honan, and Shantung were left to him in peaceable possession, he never lost heart. The resources of Wu San-kuei were ultimately found to be insufficient for the struggle, the issue of which was determined partly by his death in 1678, and partly by the powerful artillery manufactured for the Imperial forces by the Jesuit missionaries, who were then in high favour at court. The capital city of Yünnan was taken by assault in 1681, upon which Wu San-kuei's son committed suicide, and the rebellion collapsed. From that date the Manchus decided that there should be no more "princes" among their Chinese subjects, and the rule has been observed until the present day. Under the Emperor K'ang Hsi a re-arrangement of the empire was planned and carried out; that is to say, whereas during the Mongol dynasty there had only been thirteen provinces, increased to fifteen by the Mings, there was now a further increase of three, thus constituting what is known as the Eighteen Provinces, or China Proper. To effect this, the old province of Kiangnan was divided into the modern Anhui and Kiangsu; Kansuh was carved out of Shensi; and Hukuang was separated into Hupeh and Hunan. Formosa, which was finally reconquered in 1683, was made part of the province of Fuhkien, and so remained for some two hundred years, when it was erected into an independent province. Thus, for a time China Proper consisted of nineteen provinces, until the more familiar "eighteen" was recently restored by the transfer of Formosa to Japan. In addition to the above, the eastern territory, originally inhabited by the Manchus, was divided into the three provinces already mentioned, all of which were at first organized upon a purely military basis; but of late years the administration of the southernmost province, in which stands Mukden, the Manchu capital, has been brought more into line with that of China Proper.