《资治通鉴·唐纪·唐纪五》
不久，处罗患病身亡，突厥国的人怀疑是被郑元毒死，扣留了郑元，不许他回国。
未几，处罗遇疾卒，国人疑元璹毒之，留不遣。
Soon, Chuluo fell ill and died, and the people of the Turkic country suspected that he had been poisoned by Zheng Yuan, detained Zheng Yuan, and refused to allow him to return home.