《资治通鉴·隋纪·隋纪六》
当初，裴矩认为突厥始毕可汗部众逐渐强盛，就向炀帝献策分散突厥始毕可汗的势力。炀帝打算以宗室女嫁给始毕的弟弟叱吉设，并封他为南面可汗，叱吉设不敢接受册封。
初，裴矩以突厥始毕可汗部众渐盛，献策分其势，欲以宗女嫁弟叱吉设，拜为南面可汗；叱吉不敢受，始毕闻而渐怨。
At the time, Pei Ju believed that the Tujue Shibi Khan was growing too powerful, so he presented a plan to Emperor Yang to divide Tujue Shibi Khan's forces. Emperor Yang planned to marry a relative of the royal family to Shibi's younger brother, Chijieshe, and seal him as the South-Facing Khan. Chijieshe did not dare to accept the title.
<s>[INST] Kindly elucidate the central themes in this passage in English: 初，裴矩以突厥始毕可汗部众渐盛，献策分其势，欲以宗女嫁弟叱吉设，拜为南面可汗；叱吉不敢受，始毕闻而渐怨。 [/INST] At the time, Pei Ju believed that the Tujue Shibi Khan was growing too powerful, so he presented a plan to Emperor Yang to divide Tujue Shibi Khan's forces. Emperor Yang planned to marry a relative of the royal family to Shibi's younger brother, Chijieshe, and seal him as the South-Facing Khan. Chijieshe did not dare to accept the title.</s>
Kindly elucidate the central themes in this passage in English: 初，裴矩以突厥始毕可汗部众渐盛，献策分其势，欲以宗女嫁弟叱吉设，拜为南面可汗；叱吉不敢受，始毕闻而渐怨。
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At the time, Pei Ju believed that the Tujue Shibi Khan was growing too powerful, so he presented a plan to Emperor Yang to divide Tujue Shibi Khan's forces. Emperor Yang planned to marry a relative of the royal family to Shibi's younger brother, Chijieshe, and seal him as the South-Facing Khan. Chijieshe did not dare to accept the title.
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