Đại Việt sử ký toàn thư: When the protector Li Xianggu lost the people's support through greed and oppression, Yang Qing killed him.; Zizhi Tongjian…
When the protector Li Xianggu lost the people's support through greed and oppression, Yang Qing killed him.
都護李象古以貪縱苛刻失眾心，其將楊清世為蛮酋，唐開元間為驩州刺史。
Location: 外紀卷之五 「己亥冬十月，都護李象古以貪縱苛刻」
Yang Qing raids Annam, killing Protector-General Li Xianggu, his family, and over a thousand officials.
冬，十月，壬戊，容管奏安南賊楊清陷都護府，殺都護李象古及妻子、官屬、部曲千餘人。
Location: 資治通鑑 卷241
Place: Hà Nội
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