Hsüan-yeh, born in 1654, reigned from 1661 to 1722 as the K'ang-hsi Emperor. He was one of China's greatest rulers, and his reign was not only the longest but also one of the most vibrant and complex in the history of imperial China. Though he could be callous or negligent at times, and made errors of judgment, he possessed a self-analytical acuity and a sense of imperial mission that mark him as one of those rare individuals who, by acts of will, change the course of human history. It has not escaped the notice of numerous historians – Chinese, Japanese, and Western – that his reign coincided chronologically with those of Tsar Peter the Great in Russia and King Louis XIV in France, and that the three shared certain common characteristics that marked perhaps the apogee of traditional kingship in pre-industrial societies.

Any emperor of China was, of course, merely one individual, occupying a special position within his society but unable to comprehend all that society's ramifications. Also, the actions and thoughts ascribed to him were often those of others, of relatives, courtiers, eunuchs, bureaucrats. Therefore we must be cautious about seeing the ruler as the reign, of narrowing our own vision to the emperor's own. Nevertheless, the K'ang-hsi Emperor acted decisively in so many matters, and took so great an interest in affairs of governance and of culture, that his actions and his personality serve as a valid entry point for comprehending the myriad elements that led to the consolidation of Ch'ing rule.