It is obvious enough that Ssǔ-ma Chʽien at least had no doubt about the reality of Sun Wu as an historical personage; and with one exception, to be noticed presently, he is by far the most important authority on the period in question. It will not be necessary, therefore, to say much of such a work as the 吳越春秋 Wu Yüeh Chʽun Chʽiu , which is supposed to have been written by 趙曄 Chao Yeh of the 1st century AD . The attribution is somewhat doubtful; but even if it were otherwise, his account would be of little value, based as it is on the Shih Chi and expanded with romantic details. The story of Sun Tzǔ will be found, for what it is worth, in chapter 2. The only new points in it worth noting are: (1) Sun Tzǔ