 Sima Qian's (c. 91 BCE) Records of the Grand Historian (26 , tr. Watson 1993 1:113; cf. Yü 1965:92 ) mentions bigu in connection with Zhang Liang (262-189 BCE), or the Marquis of Liu, who served as teacher and strategist for Emperor Gaozu of Han (r. 202-195 BCE).
<clarity>  Sima Qian's (c. 91 BCE) Records of the Grand Historian (26 , tr. Watson 1993 1:113; cf. Yü 1965:92 ) mentions bigu in connection with Zhang Liang (262-189 BCE), or the Marquis of Liu, who served as teacher and strategist for Emperor Gaozu of Han (r. 202-195 BCE).
 Sima Qian's (c. 91 BCE) Records of the Grand Historian (26 ) mentions bigu in connection with Zhang Liang (262-189 BCE), or the Marquis of Liu, who served as teacher and strategist for Emperor Gaozu of Han (r. 202-195 BCE).